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Knowledge Center · Psychiatry

Types of Mental IllnessWhat they are, how they are classified, and when you need a psychiatrist

Reviewed by: Dr. Mahmoud El-Sawy Last updated: September 28, 2026 14-minute read
The short answer

Mental illnesses are disorders of thinking, emotions or behavior that cause real distress or disrupt daily life. They are not a sign of weak character or weak faith. Medically, they are classified under DSM-5 and ICD-11 into groups, the best known being mood disorders, anxiety, obsessive and trauma-related disorders, psychotic disorders, and personality disorders. Around one person in seven worldwide lives with a mental disorder, and most of these conditions are treatable.

  • Anxiety and depression are the most common mental illnesses in the world.
  • A psychiatrist diagnoses and prescribes medication; a psychologist provides talk therapy and testing.
  • Many mental illnesses overlap with addiction, and the two need integrated treatment.

What are mental illnesses?

A mental illness, or mental disorder, is a health condition that affects the way a person thinks, feels or behaves, to the point of causing real distress or disrupting their studies, work and relationships. It is an illness like any other: it has causes, it can be diagnosed, and it responds to treatment.

What separates “mental illness” from normal emotions is intensity, duration and impact. Grief after losing a loved one, nerves before an exam, and fear in a dangerous situation are all normal human responses. But when sadness lasts for weeks and takes away the ability to enjoy anything, when anxiety becomes a daily companion that prevents sleep and work, or when thoughts and beliefs appear that pull a person away from reality, we are talking about a disorder that needs a specialist assessment.

The World Health Organization stresses that mental illnesses are very diverse and that each has effective treatments. Yet most people affected around the world do not receive the care they need, either because services are scarce or because of stigma and fear of what people will say.

Biological factors

Genetics, brain chemistry and circuits, hormones, physical illnesses, and certain medications and drugs.

Psychological factors

Trauma, the way a person thinks about themselves and the world, and coping skills for dealing with stress.

Social factors

Poverty, unemployment, violence, isolation, family breakdown and chronic stress.

Almost no mental illness has a single cause. These three sets of factors are intertwined, which is why two people can go through the same circumstances and one becomes ill while the other does not. The causes of each disorder are covered on its own page.

How are mental illnesses classified?

Psychiatrists around the world rely on two main systems for classification and diagnosis. The first is the Diagnostic and Statistical Manual of Mental Disorders (DSM-5-TR), published by the American Psychiatric Association. The second is the International Classification of Diseases (ICD-11), published by the World Health Organization, which has a full chapter on mental, behavioral and neurodevelopmental disorders.

A brief comparison of the two classification systems
Point of comparisonDSM-5-TRICD-11
Published byAmerican Psychiatric AssociationWorld Health Organization
ScopeMental disorders onlyAll diseases, with mental disorders as one chapter
Widest useResearch and practice in the US and beyondHealth statistics, insurance and official health systems worldwide
Diagnostic approachSpecific criteria for each disorder: number of symptoms, duration and impactCore clinical descriptions, with more flexibility for the doctor

The two systems are quite close in the names and groupings of disorders. For example, both place obsessive-compulsive disorder in its own group, separate from anxiety disorders, and both place post-traumatic stress disorder among the stress- and trauma-related disorders.

What are the most common types of mental illness?

Below are the families of mental disorders in the Eradah guide. Each disorder has a full page explaining its symptoms, causes, treatment and relationship to addiction:

Mood disorders

A persistent low mood, or swings between low and high moods. These are among the leading causes of disability worldwide, and among the most responsive to treatment.

Depression

Depression
Most searched

Also known as: clinical depression

Persistent sadness and loss of pleasure and energy lasting two weeks or more, affecting sleep, appetite, concentration and work.

Category
Mood disorders
How common
About 5% of adults worldwide
Typical onset
At any age, often in adolescence and early adulthood
Link to addiction
Strong

When to seek help: if sadness and loss of pleasure last two weeks or more, and immediately if there are any thoughts about death.

Bipolar disorder

Bipolar disorder
Most searched

Also known as: manic depression

Alternating episodes of mania or hypomania and depression, often linked to substance misuse.

Category
Mood disorders
How common
About 36 million people worldwide
Typical onset
Usually late adolescence or early adulthood
Link to addiction
Very strong

When to seek help: during an episode of excessive activity and unusually little sleep, or depression that was preceded by clear periods of “high” mood.

Postpartum depression

Postpartum Depression

Also known as: postnatal depression

A true depression that begins during pregnancy or in the first year after birth. It differs from the “baby blues” of the first days, and it can be treated safely.

Category
Mood disorders
How common
More than 10% of new mothers
Typical onset
Pregnancy or the first year after birth
Link to addiction
Weak

When to seek help: if sadness or exhaustion lasts more than two weeks, and immediately if there are hallucinations or thoughts of harming yourself or the baby.

Full guide to mood disorders →

Anxiety, obsessive-compulsive and trauma-related disorders

Fear, anxiety, repetitive thoughts and the effects of trauma, when they go beyond their normal limits and take over daily life.

Also known as: chronic anxiety

Excessive worry about everyday matters that is hard to control and lasts for months, with tension, sleeplessness and fatigue.

Category
Anxiety disorders
How common
One of the most common anxiety disorders
Typical onset
At any age, usually beginning gradually
Link to addiction
Strong

When to seek help: if worry has become daily for months, is hard to control, and affects your sleep and work.

Panic attacks

Panic disorder
Most searched

Also known as: panic disorder

Sudden episodes of intense fear with a pounding heart and shortness of breath, which the person often believes is a heart attack.

Category
Anxiety disorders
How common
Common, and more so in women
Typical onset
Usually late adolescence or early adulthood
Link to addiction
Strong

When to seek help: once a heart cause has been ruled out by an examination, if attacks keep recurring and you have come to fear them.

Social phobia

Social anxiety

Also known as: pathological shyness

Intense fear of social situations and of being judged by others, which leads some people to turn to drugs or alcohol to get through them.

Category
Anxiety disorders
How common
One of the most common anxiety disorders
Typical onset
Usually childhood or adolescence
Link to addiction
Strong

When to seek help: if you avoid school, work or social occasions out of fear of embarrassment, or need a substance in order to face people.

Repetitive, distressing thoughts and compulsive acts meant to ease the anxiety they cause, taking up hours of the person's day.

Category
Obsessive-compulsive and related disorders
How common
Less common than anxiety, but not rare
Typical onset
Usually between late childhood and early adulthood
Link to addiction
Moderate

When to seek help: if the thoughts or rituals take up a large part of each day or disrupt your life and relationships.

Also known as: post-traumatic stress

Intrusive memories, nightmares, avoidance and heightened alertness after exposure to a traumatic event.

Category
Trauma-related disorders
How common
About 3.9% of people over a lifetime
Typical onset
Usually within a month of the traumatic event
Link to addiction
Very strong

When to seek help: if nightmares, intrusive memories and avoidance last more than a month after the trauma.

Phobias

Phobias (Specific Phobia)

Also known as: specific phobia

Intense, persistent fear of a specific object or situation that is out of proportion to its real danger and leads to avoidance. It responds well to exposure therapy.

Category
Anxiety disorders
How common
About 7.4% of people over a lifetime
Typical onset
Usually childhood (around age 8)
Link to addiction
Moderate

When to seek help: if fear makes you turn down a job, travel or important treatment, or you need a sedative to face it.

Illness anxiety

Health Anxiety

Also known as: health anxiety, hypochondria

Persistent fear of having a serious illness despite normal test results, with repeated searching, checking and reassurance-seeking.

Category
Anxiety and physical symptoms
How common
About 5.7% over a lifetime
Typical onset
Usually early adulthood
Link to addiction
Weak

When to seek help: if the fear persists for six months or more despite normal test results and affects your work and life.

Body dysmorphic disorder

Body Dysmorphic Disorder

Also known as: body dysmorphia

A painful preoccupation, lasting hours, with a flaw in appearance that others cannot see or that looks very minor. It is not vanity.

Category
Obsessive-compulsive and related disorders
How common
Between 2% and 3% of people
Typical onset
Usually adolescence
Link to addiction
Moderate

When to seek help: if thinking about your appearance takes hours each day or keeps you from going out, and immediately if you feel any hopelessness.

Hoarding disorder

Hoarding Disorder

Also known as: compulsive hoarding

Severe difficulty getting rid of belongings, until they pile up and make rooms of the home unusable, with distress when sorting is attempted.

Category
Obsessive-compulsive and related disorders
How common
About 2.5% of adults
Typical onset
Adolescence, worsening with age
Link to addiction
Weak

When to seek help: if clutter stops you from using your home, threatens safety, or causes ongoing conflict with family.

Adjustment disorder

Adjustment Disorder

Also known as: situational depression

A stronger-than-expected emotional reaction to a stressful event or major change, beginning within 3 months of the event.

Category
Trauma and stress
How common
About 2% of people
Typical onset
Any age, within 3 months of the event
Link to addiction
Moderate

When to seek help: if your reaction to the change disrupts your work or home life, and immediately if you have any thoughts of harming yourself.

Full guide to anxiety, obsessive-compulsive and trauma-related disorders →

Psychotic disorders

Disorders in which a person loses part of their connection with reality. Some are triggered directly by drug use, and all need early intervention.

Schizophrenia

Schizophrenia
Most searched

Also known as: schizophrenia

A chronic disorder involving hallucinations, delusions and disordered thinking. It requires medication and long-term follow-up.

Category
Psychotic disorders
How common
About 1 in 300 people worldwide
Typical onset
Late adolescence to the early thirties
Link to addiction
Very strong

When to seek help: if there is hearing of voices, unusual beliefs or sudden withdrawal. Early intervention improves outcomes.

Drug-induced psychosis

Substance-induced psychosis
Most searched

Also known as: substance-induced psychosis

Hallucinations and delusions that appear during the use of substances such as crystal meth (shabu), Strox (synthetic cannabinoids) and hashish, or after stopping them.

Category
Psychotic disorders
How common
Not known precisely; more common with stimulants and synthetic cannabinoids
Typical onset
During use, intoxication or after stopping
Link to addiction
Very strong

When to seek help: immediately if there are any hallucinations, intense suspicion or aggression after drug use. This is an emergency.

Psychosis

Psychosis

Also known as: psychotic episode

A partial loss of contact with reality through hallucinations, delusions or disordered thinking. It has many causes and often recovers with early treatment.

Category
Psychotic disorders
How common
15 to 100 new cases per 100,000 people per year
Typical onset
Late adolescence to the mid-twenties
Link to addiction
Strong

When to seek help: if hallucinations or unusual suspicions appear, if voices command harm, or if sudden psychosis comes with fever or confusion.

Paranoia

Paranoia

Also known as: persecutory suspicion

Persistent suspicion, without enough evidence, that others mean harm. It ranges from passing thoughts to persecutory delusions.

Category
A symptom in psychotic and personality disorders
How common
From under 2% to about 30%, depending on the type of thought
Typical onset
Any age, increasing with stress and lack of sleep
Link to addiction
Strong

When to seek help: if it appears suddenly with hallucinations or after drug use, if the person refuses to eat for fear of poison, or if they threaten to harm someone.

Hallucinations

Hallucinations

Also known as: hallucinating

Perceiving through the senses something that is not there, most famously hearing voices. It is a symptom, not a diagnosis, and some forms, such as hallucinations before sleep, are normal.

Category
A symptom in psychosis and other conditions
How common
5.2% have experienced them at least once
Typical onset
Any age; when they appear in older age they call for an examination
Link to addiction
Strong

When to seek help: if they appear suddenly with confusion or fever, after stopping alcohol, or if the voices command harm.

Delusional disorder

Delusional Disorder

A firmly held false belief lasting a month or more despite evidence, with a life that otherwise seems normal away from the subject of the delusion.

Category
Psychotic disorders
How common
Rare (0.05 to 0.1% of adults)
Typical onset
Middle age, around 40
Link to addiction
Moderate

When to seek help: if an idea that cannot be argued with takes over decisions and relationships, and immediately if there is any threat or stalking.

Grandiosity

Grandiosity

Also known as: grandiose delusions

An unrealistic certainty of having exceptional abilities, status or a mission. It is often a symptom of mania, psychosis or stimulant use.

Category
A psychotic symptom or personality trait
How common
About 28% of psychiatric samples
Typical onset
Often sudden, with mania or drug use
Link to addiction
Strong

When to seek help: if unrealistic plans appear along with overspending or little sleep, and immediately if there is aggression or hallucinations.

Schizoaffective disorder

Schizoaffective Disorder

Also known as: affective schizophrenia

Schizophrenia-type symptoms such as hallucinations and delusions occurring together with episodes of depression or mania. Many people become stable with regular treatment.

Category
Psychotic disorders
How common
About 0.3% over a lifetime
Typical onset
Late adolescence and early adulthood
Link to addiction
Strong

When to seek help: if hallucinations or delusions appear with depression or mania, and immediately if there is any talk of death or voices commanding harm.

Full guide to psychotic disorders →

Personality disorders

Enduring patterns of thinking, feeling and relating to others that begin early and cause distress to the person and those around them.

Also known as: borderline personality

Sharp swings in emotions, relationships and self-image, with impulsivity and an intense fear of abandonment.

Category
Personality disorders
How common
Affects a small share of people and is often diagnosed in young adults
Typical onset
Adolescence or early adulthood
Link to addiction
Very strong

When to seek help: when sharp swings threaten relationships and work, and immediately in cases of self-harm or threats of it.

Also known as: narcissistic personality, narcissist

An exaggerated sense of self-importance and a constant need for admiration, with poor empathy for others.

Category
Personality disorders
How common
Uncommon and hard to estimate precisely
Typical onset
Early adulthood
Link to addiction
Moderate

When to seek help: if crises keep recurring at work and in relationships, or are accompanied by depression or substance use.

Also known as: psychopathic personality

A persistent disregard for the rights of others and for the law, with impulsivity and a lack of guilt.

Category
Personality disorders
How common
Uncommon, and more so in men
Typical onset
Conduct problems before age 15; not diagnosed before 18
Link to addiction
Very strong

When to seek help: when violence, risk-taking or legal trouble keep recurring, especially alongside substance use.

Avoidant personality

Avoidant Personality Disorder

Also known as: avoidant personality disorder

A constant fear of rejection and criticism with feelings of inadequacy, leading the person to keep away from others even though they long for connection.

Category
Personality disorders
How common
About 2.1% (United States)
Typical onset
Early adulthood
Link to addiction
Moderate

When to seek help: if fear of rejection keeps you from school, work or any relationship, or you have turned to a substance to calm anxiety.

Dependent personality disorder

Dependent Personality Disorder

Also known as: dependent personality

An excessive need to be taken care of by others and to have them make decisions for you, with intense fear of being alone or separated.

Category
Personality disorders
How common
Less than 1% of people
Typical onset
Early adulthood
Link to addiction
Moderate

When to seek help: if fear of being alone keeps you in a harmful relationship or stops you from making any decision on your own.

Histrionic personality

Histrionic Personality Disorder

Also known as: histrionic personality disorder

A constant need to be the center of attention, with rapidly shifting emotions and dramatic, exaggerated expression.

Category
Personality disorders
How common
Less than 2% of people
Typical onset
Early adulthood
Link to addiction
Weak

When to seek help: if emotional crises recur or depression appears when attention is absent, and immediately if there is any threat of self-harm.

Obsessive-compulsive personality disorder

Obsessive-Compulsive Personality Disorder

Also known as: obsessive personality

A constant preoccupation with order, perfection and control, without flexibility, to the point that checking gets in the way of finishing the work itself.

Category
Personality disorders
How common
About 4.7% on average
Typical onset
Early adulthood
Link to addiction
Weak

When to seek help: if perfectionism is costing you your job or your marriage, or symptoms of depression appear.

Schizoid personality disorder

Schizoid Personality Disorder

Also known as: schizoid personality

A lasting detachment from close relationships and emotional coldness, without hallucinations or delusions.

Category
Personality disorders
How common
About 0.9% on average
Typical onset
Early adulthood
Link to addiction
Weak

When to seek help: if signs of depression or severe self-neglect appear, and immediately if hallucinations or unusual thoughts appear.

Full guide to personality disorders →

Other common disorders

Disorders that do not belong to the families above but are closely tied to addiction, as a cause or as a consequence.

Also known as: ADHD

A developmental disorder that begins in childhood and continues into adulthood for many people. It increases the risk of addiction if left untreated.

Category
Neurodevelopmental disorders
How common
One of the most common developmental disorders in children
Typical onset
Childhood; symptoms appear before age 12
Link to addiction
Strong

When to seek help: if distractibility and impulsivity keep affecting school, work or relationships.

Also known as: sleep disorder

Persistent difficulty falling or staying asleep for three months or more, and a common route into the misuse of sleeping pills.

Category
Sleep disorders
How common
Very common, and increasing with age
Typical onset
At any age, often after a period of stress
Link to addiction
Strong

When to seek help: if trouble sleeping continues three nights a week for three months, or you have come to depend on a sleeping pill without a doctor.

Eating disorders

Eating disorders

Also known as: anorexia nervosa, bulimia nervosa

Serious disturbances in a person's relationship with food and body image, including anorexia nervosa, bulimia nervosa and binge eating episodes.

Category
Feeding and eating disorders
How common
About 18 million people worldwide (2023)
Typical onset
Usually adolescence and early adulthood, and may begin in childhood
Link to addiction
Strong

When to seek help: if food, weight or body shape dominates your thoughts and life, and immediately if there is fainting, palpitations or thoughts about death.

Autism

Autism Spectrum Disorder (ASD)

Also known as: autism spectrum disorder

A difference in brain development that affects communication, behavior and the senses. Early support makes a big difference.

Category
Neurodevelopmental disorder
How common
About 1 in 127 people worldwide
Typical onset
Usually in the first two years
Link to addiction
Moderate

When to seek help: if a child loses skills they had gained, or has seizures or self-harm, or if a teenager or adult has thoughts about death.

Tourette syndrome

Tourette syndrome

Also known as: Tourette's disorder

Motor and vocal tics that begin in childhood, peak around age ten and often ease in adolescence.

Category
Neurodevelopmental disorder (tics)
How common
3 to 9 per 1,000 children
Typical onset
Between 4 and 6 years
Link to addiction
Weak

When to seek help: if tics interfere with school or cause pain, or are accompanied by anxiety, depression or substance use.

Hysteria

Functional neurological disorder (conversion disorder)

Also known as: conversion disorder

Real neurological symptoms such as paralysis and seizures without structural damage, caused by a problem in the way the nervous system functions.

Category
Functional neurological disorder
How common
Among the most common conditions seen in neurology clinics
Typical onset
Late childhood to early adulthood
Link to addiction
Weak

When to seek help: if weakness or a seizure appears for the first time, if symptoms interfere with life, or if depression accompanies them.

Depersonalization

Depersonalization-derealization disorder

Also known as: derealization

A persistent feeling of detachment from oneself or the world, with intact awareness that it is not real. It improves with treatment.

Category
Dissociative disorder
How common
About 1 to 2% as an ongoing disorder
Typical onset
Average age of onset 16
Link to addiction
Moderate

When to seek help: if the feeling lasts for weeks or disrupts your life, began after substance use, or comes with depression.

Kleptomania

Kleptomania

Also known as: compulsive stealing

An irresistible urge to steal things the person does not need, followed by guilt and shame. The motive is neither need nor profit.

Category
Impulse-control disorders
How common
Between 0.3% and 0.6% of people
Typical onset
Usually adolescence or early adulthood
Link to addiction
Strong

When to seek help: if stealing keeps happening despite attempts to stop, and immediately if there are any thoughts of harming yourself.

Dissociative identity disorder

Dissociative Identity Disorder

Also known as: multiple personality disorder

Two or more distinct identities with gaps in memory, strongly linked to severe, repeated trauma in childhood.

Category
Dissociative disorders
How common
About 1.5% in one small study
Typical onset
Childhood; diagnosis is often delayed
Link to addiction
Moderate

When to seek help: if memory gaps or “lost time” keep recurring, and immediately if there is any self-harm.

Psychosomatic disorders

Psychosomatic Disorders

Also known as: psychosomatic illnesses

Real physical symptoms and illnesses in which psychological stress plays a major part in their onset or worsening, such as irritable bowel syndrome.

Category
Interaction of mind and body
How common
Common, and not counted as a single category
Typical onset
Any age, increasing with stress
Link to addiction
Moderate

When to seek help: if symptoms recur with stress and tests do not explain them, after physical causes have been ruled out first.

Full guide to other common disorders →

Mental states and traits

States, feelings and traits that many people go through. Most are not stand-alone diagnoses, but they can be the beginning of a disorder or a doorway to substance use if they become intense and prolonged.

Psychological stress

Psychological Stress

Also known as: mental tension

A natural response to life's demands that, if it continues, becomes a burden on sleep, the heart and mood.

Category
A mental state, not a diagnosis
How common
Everyone experiences it to varying degrees
Typical onset
Any age, with difficult situations
Link to addiction
Strong

When to seek help: if tension continues for weeks and disrupts your sleep or work, or you have begun to rely on a substance to calm yourself.

Overthinking

Overthinking

Also known as: excessive thinking

Going round and round the same thoughts without reaching a solution, which steals sleep and is linked to anxiety and depression.

Category
A thinking pattern, not a diagnosis
How common
Very common, with no exact figure
Typical onset
Any age, worsening with stress
Link to addiction
Moderate

When to seek help: if it takes up hours of your day and your sleep for weeks, or comes with persistent sadness or compulsive rituals.

Nervous breakdown

Nervous Breakdown

Also known as: mental health crisis

The moment when stress or mental illness exceeds a person's ability to cope, and daily functioning stops.

Category
A mental health crisis, not a diagnosis
How common
26% in a 1996 US survey
Typical onset
Any age, after intense stress
Link to addiction
Moderate

When to seek help: if you cannot manage daily tasks or symptoms last two weeks, and immediately if there are thoughts of self-harm or hallucinations.

Irritability

Anger & Irritability

Also known as: angry outbursts

Quick, intense anger out of proportion to the situation, usually with a treatable cause behind it such as stress, lack of sleep or substance use.

Category
A mental state that may be a disorder
How common
Intermittent explosive disorder 7.3% (US survey)
Typical onset
Usually adolescence
Link to addiction
Strong

When to seek help: if outbursts recur and damage your relationships or work, and immediately if they reach threats or violence.

Burnout

Burnout

Also known as: job burnout

Exhaustion, negativity toward work and reduced effectiveness caused by chronic stress. It can lead to depression and reliance on sedatives.

Category
An occupational phenomenon in ICD-11, not a mental illness
How common
Common, with estimates varying by profession
Typical onset
Gradually, with chronic work stress
Link to addiction
Moderate

When to seek help: if exhaustion lasts for weeks despite rest, if loss of pleasure spreads to everything, or if thoughts about death appear.

Loneliness and social isolation

Loneliness and social isolation

Also known as: social isolation

A painful feeling that your relationships are fewer or weaker than you need. It is linked to depression and heart disease, and is one of the strongest drivers of substance use.

Category
A common mental state, not an illness
How common
About 1 in 6 people worldwide
Typical onset
At any age, and highest among teenagers
Link to addiction
Strong

When to seek help: if loneliness is accompanied by persistent sadness, if substance use has become a way to fill the emptiness, or if thoughts about death appear.

Pathological jealousy

Pathological jealousy

Also known as: morbid jealousy

Persistent, unjustified suspicion that a partner is unfaithful that reassurance cannot calm. Alcohol and stimulants are well-known causes, and it can turn to violence.

Category
A symptom pattern, not a stand-alone diagnosis
How common
Delusional jealousy is relatively rare
Typical onset
At any age; late onset calls for an examination
Link to addiction
Strong

When to seek help: if suspicion has become daily and restricts the partner's life, and immediately if there is any threat or violence.

Self-harm

Self-harm

Also known as: self-injury

A person deliberately hurting their body to ease unbearable emotional pain. It is a sign of severe distress that deserves help without blame.

Category
A behavior of distress, not a stand-alone illness
How common
About 17% of adolescents and 5.5% of adults
Typical onset
Usually in adolescence
Link to addiction
Strong

When to seek help: It always deserves a mental health assessment, and immediately if there is an injury needing treatment or any talk of death.

Suicidal thoughts

Suicidal thoughts

Also known as: thinking about suicide

Thoughts of death or ending one's life mean pain has passed what a person can bear, not a final decision. Support and treatment ease them markedly.

Category
A sign of emotional pain, not a stand-alone illness
How common
More common than people think, and they pass with support
Typical onset
At any age, and more among young people
Link to addiction
Strong

When to seek help: Now, if there are any thoughts of ending your life: call 16328 or 123, and do not stay alone.

Impostor syndrome

Impostor syndrome

Also known as: impostor phenomenon

A constant feeling that you do not deserve your success and will be found out. It is linked to anxiety, depression and burnout.

Category
A common psychological phenomenon, not a medical diagnosis
How common
Between 9% and 82%, depending on the measurement tool
Typical onset
From adolescence to the highest positions
Link to addiction
Weak

When to seek help: if the feeling of being a fraud comes with persistent sadness, sleeplessness or anxiety attacks, or reliance on stimulants and sedatives.

Stockholm syndrome

Stockholm syndrome

Also known as: trauma bonding with an abuser

Sympathy and attachment from a victim toward the person holding or harming them, as a means of survival. It is treated much like the effects of trauma.

Category
A reaction to trauma, not an official diagnosis
How common
Rare among victims of captivity and abuse
Typical onset
After captivity or ongoing abuse
Link to addiction
Weak

When to seek help: if there is immediate danger from the abuser, or if trauma effects such as panic, sleeplessness and intrusive memories remain.

Toxic personality

Toxic personality

Also known as: toxic person

A repeated pattern of manipulation, control and belittling that makes you doubt yourself. It is not a medical diagnosis, but its effect is real.

Category
A description of harmful behavior, not a medical diagnosis
How common
No scientific figure exists because it is not a diagnosis
Typical onset
A repeated pattern at any age
Link to addiction
Moderate

When to seek help: if anxiety and loss of self-confidence continue after you have distanced yourself, and immediately if there is any threat or violence.

Also known as: introversion

Someone who recharges in quiet rather than in a crowd. It is a normal trait, different from shyness, social phobia and depression.

Category
A normal personality trait, not a disorder
How common
Common; people fall along a wide spectrum
Typical onset
Relatively stable, and may change with age
Link to addiction
Weak

When to seek help: if withdrawal comes with fear that disrupts school or work, prolonged sadness, or sudden withdrawal with hopelessness.

Highly sensitive personality

Highly sensitive person

Also known as: highly sensitive person

Someone who is affected more deeply by sounds, crowds and other people's feelings. It is a normal trait that is shaped by the environment, for better or worse.

Category
A normal personality trait, not a disorder
How common
About 31% were highly sensitive in one study
Typical onset
A temperament trait from early childhood
Link to addiction
Weak

When to seek help: if sensitivity turns into sadness or anxiety that lasts for weeks, or you have started avoiding work and people.

Full guide to mental states and traits →

Guides answering common mental health questions

Stand-alone pages explaining conditions and questions that many people search for, to help you understand what you or someone close to you is going through:

Mood

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Sadness for no reason: why do you suddenly feel low, and what can you do?

Sadness for no reason usually has a cause you have not noticed: lack of sleep, built-up stress, a change of seasons, the thyroid, or ongoing depression. Find out…

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Mood

Loss of passion (anhedonia): why does nothing make you happy any more?

Loss of passion, or anhedonia, is the absence of pleasure and interest in what you used to love. Learn its two types, its link to depression, addiction and dopamine, and when…

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Self-confidence

Low self-confidence: its signs, causes and steps to treatment

Low self-confidence makes you see yourself as less than you are and avoid opportunities. Learn its signs, its roots in childhood, its link to depression and anxiety,…

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Concentration

Causes of poor concentration: from sleep and stress to the thyroid and drugs

The causes of poor concentration are many: lack of sleep, stress, depression, distractibility, an underactive thyroid, vitamin B12 deficiency, and hashish. Learn…

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Sleep

Sleep disorders: types, symptoms and when you need a doctor

Sleep disorders are not limited to insomnia. They include sleep apnea, restless legs, narcolepsy and body clock disorders.…

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Behaviors

Talking to yourself: when is it normal and when does it point to mental illness?

Talking to yourself is a habit most people have, and it can help you focus and calm tension. Learn its benefits, and how it differs from answering voices,…

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Trauma

Psychological trauma: its symptoms, types and how to recover

Psychological trauma is the effect of a frightening or harmful event that shakes your sense of safety. Learn the normal reactions that follow, its types, and when it becomes a disorder,…

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Trauma

Emotional trauma: its symptoms after a breakup or betrayal and how to get through it

Emotional trauma is real psychological pain after a breakup, an infidelity or being let down by someone close. Learn its psychological and physical symptoms, and why rejection hurts…

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Anxiety

Exam anxiety: its symptoms and a practical plan from studying to the exam hall

Exam anxiety and going blank in front of the paper: its physical and psychological symptoms, a plan from the weeks of study to the exam hall, the role of parents, and the danger of pills…

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Anxiety

Separation anxiety: when is it normal in a child and when does it become a disorder?

Separation anxiety in children and adults: when it is a normal stage and when it becomes a disorder, its symptoms and school refusal, and how parents handle the moment of…

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Mind and body

Psychological shortness of breath: its symptoms and causes, and how to tell it from a physical cause

Psychological shortness of breath is a feeling of being unable to take a full breath, linked to anxiety, stress and panic attacks. Learn its symptoms and the warning signs that…

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Personality

The manipulative personality: its tactics, signs and how to protect yourself

A manipulative personality steers you toward what they want through guilt, doubt, and lavish attention followed by withdrawal. Learn the best-known tactics such as gaslighting and love bombing,…

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Children

Oppositional defiant disorder: stubbornness that goes beyond the normal

Oppositional defiant disorder in children: its symptoms and diagnostic criteria, how it differs from ordinary stubbornness and conduct disorder, its causes,…

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Children

Mental illness in children: types, warning signs and when to worry

Mental illness in children and teenagers: the best-known types and how common they are, warning signs at each age, the difference between developmental behavior and a disorder, and what…

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Basics

Causes of mental illness: genetics, the brain, experiences and environment

The causes of mental illness as science explains them: genetics and brain chemistry, difficult childhood experiences, stress, drugs, physical illnesses, and what…

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Basics

Is mental illness hereditary? What twin and family studies say

Is mental illness hereditary? Heritability rates for schizophrenia, bipolar disorder, depression and ADHD, the risk to children, and whether genetic testing helps,…

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Basics

The difference between mental illness and psychiatric illness: are they the same thing?

The difference between “mental illness” and “psychiatric illness” in modern medicine and in everyday speech, how both differ from neurological diseases and intellectual disability, and how to deal…

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Basics

The difference between neurosis and psychosis: reality, insight and treatment

The difference between neurosis and psychosis, simply put: a patient's contact with reality and awareness of their illness, examples of each, why modern classification dropped the word neurosis, and whether…

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For families

The behavior of a person with mental illness: what does it mean and is it deliberate?

The behavior of a person with mental illness is easier to understand than it seems: withdrawal, irritability, suspicion, talking to themselves and denial, what it signifies in each disorder, and the truth about…

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Marriage

Mental illness and marriage: is it permitted? What do research and the law say?

Mental illness and marriage: can a person with mental illness marry? The effect of disorders on married life, when to disclose before marriage, medication and pregnancy,…

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The law

Is a person with mental illness responsible for their actions? Egyptian law and psychiatry

Is a person with mental illness responsible for their actions? The text of Article 62 of the Egyptian Penal Code, the difference between loss and impairment of awareness, the ruling on drugs, and examination of the accused…

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Psychiatric medications and treatment methods

Treatment of most mental disorders combines medication and psychotherapy, and the doctor decides the right plan for each case. Here are our detailed guides to the most commonly used medications and treatment methods:

How many people in the world have a mental illness?

The latest World Health Organization figures show that mental illness is closer to us than we think. It touches almost every family, directly or indirectly:

1.2 billionpeople lived with a mental disorder in 2023, about 1 in 7
470 millionpeople have anxiety disorders, including 146 million children and adolescents
322 millionpeople have depression, including 43 million children and adolescents
1 in 300people worldwide live with schizophrenia

More serious than the scale of prevalence is the “treatment gap.” According to the same organization, only about one-third of people with depression receive formal mental health care, even in high-income countries, and about one-quarter of those with anxiety disorders. The proportion is lower in middle- and low-income countries. There are no precise, up-to-date, unified figures for the prevalence of each disorder in Egypt, so we limit ourselves here to the documented global figures.

Source: World Health Organization fact sheets on mental disorders, depression and anxiety.

How does Egyptian society view mental illness?

Many people in our society still hesitate to see a psychiatrist, for fear of the word “crazy,” of the effect on marriage and job prospects, or because they regard mental illness as a sign of weak faith or low endurance. This stigma leads some families to hide the patient or to turn first to non-medical solutions, so months and years are lost in which the person could have improved.

The truth is that asking for mental health help takes courage, and that faith, prayer and family support are important supports that go hand in hand with medical treatment and do not conflict with it, just as a person with diabetes prays and takes their treatment at the same time.

Common myths about mental illness, and the truth
The mythThe truth
“Mental illness is weak character or weak faith”It is a health condition with biological, psychological and social causes, and it can affect the strongest and most devout people.
“Anyone who goes to a psychiatrist is crazy”Most people who see a psychiatrist have anxiety, depression or insomnia, and carry on with their lives and work as normal.
“Psychiatric medications all cause addiction”Most psychiatric medications, such as antidepressants, do not cause addiction. The few that need caution are prescribed and monitored by the doctor.
“A person with mental illness is a danger to others”The great majority of people with mental illness are not inclined to violence. In fact, they are more likely to be the victims of harm.
“It will go away on its own if he keeps himself busy”Staying busy and having support help, but moderate and severe disorders need specialist treatment, and delay makes them harder.

When do you need to see a psychiatrist?

You do not have to reach a “breakdown” before asking for help. Early assessment shortens suffering and makes treatment easier and shorter. Consider consulting a psychiatrist if you notice in yourself or someone close to you:

  • Sadness, loss of pleasure or anxiety lasting two weeks or more without improvement.
  • A clear and persistent disturbance in sleep, appetite or energy.
  • A marked decline in school or work, or withdrawal from family and friends.
  • Sudden attacks of fear, or repeated thoughts and rituals that take up time.
  • Strange changes in speech or behavior, intense suspicion, or hearing things others do not hear.
  • Relying on alcohol, drugs or sleeping pills to cope with feelings.
  • Any thoughts about death or self-harm. These call for seeking help immediately.

What is the difference between a psychiatrist and a psychologist?

Many people confuse the two specialties, though each has a different role that complements the other. In most cases the best results come when they work together in one team:

Psychiatrist vs. psychologist
Point of comparisonThe psychiatristThe psychologist
SchoolA medical doctor who specialized in psychiatry after medical schoolA psychology graduate with clinical training
DiagnosisDiagnoses disorders and rules out physical causesConducts interviews, tests and psychological scales
Prescribing medicationYes, and monitors side effectsDoes not prescribe medication
Talk therapyMay provide it or refer for itTheir main specialty, such as cognitive behavioral therapy
When to start with them?Severe symptoms, psychosis, thoughts of death, and addictionStress and mild to moderate problems, after assessment

If you are not sure where to start, start with the psychiatrist. They can assess the whole picture and decide whether it needs medication, psychotherapy or both.

Can mental illness be treated?

Yes. Most mental illnesses respond to treatment, and many people with them live stable, productive lives. Treatment varies with the disorder and its severity, but it usually rests on three pillars:

  1. Pillar 1
    Psychological therapy

    Structured sessions such as cognitive behavioral therapy and family therapy that change patterns of thinking and behavior.

  2. Pillar 2
    Medication treatment

    Antidepressants, mood stabilizers, antipsychotics and others, by prescription and under the follow-up of a psychiatrist only.

  3. Pillar 3
    Support and rehabilitation

    Regular sleep, physical activity, family support and a gradual return to work and study.

  4. When needed
    Hospital stay

    In acute cases or when there is a risk to oneself or others, for a limited period.

No psychiatric medication should be started, changed or stopped except on the doctor's decision, even if the patient feels better. In Egypt, the Mental Health Care Law No. 71 of 2009 guarantees patients' rights to confidentiality and dignified treatment, and sets controls for any compulsory admission to hospital. This is general educational information and not legal advice.

What is the relationship between mental illness and addiction?

The relationship between mental illness and addiction is close and two-way, and doctors call it “dual diagnosis”. The US National Institute on Drug Abuse explains that many people with addiction have another mental illness, and the reverse is true, and that the two share risk factors such as genetics, trauma and stress.

Self-medication

Some people with anxiety, depression, insomnia or trauma turn to a substance that eases their suffering for a while, and fall into addiction.

The drug creates the illness

Some substances, such as crystal meth (shabu), Strox (synthetic cannabinoids) and hashish, can cause psychosis or depression or bring out a latent illness.

A vicious circle

Each makes the other worse, and raises the risk of relapse and self-harm if only one of them is treated.

That is why effective treatment is integrated treatment, which deals with the mental disorder and the addiction at the same time and with one team, and it is the core of Eradah's work. Read more on the dual diagnosis page, or browse the guide to drugs and their types.

How do you support a person with a mental illness?

The role of family and friends can be the difference between a person whose treatment is delayed for years and one who begins recovery early. Here are practical steps to help:

  1. Start a calm conversation at a suitable time, and express your concern with phrases like “I've noticed you haven't been comfortable lately” rather than accusation.
  2. Listen more than you speak, and do not belittle their feelings with phrases like “you're being spoiled” or “others have it worse than you.”
  3. Encourage them to see a psychiatrist, and offer to book the appointment or go with them.
  4. Support their commitment to treatment, and do not advise them to stop medication because they have “improved” or out of fear of “getting used to it.”
  5. Protect their privacy, and do not make their illness a topic of conversation in the wider family.
  6. Look after your own mental health too. Supporting someone for a long time is exhausting and you need support as well.
  7. If they talk about death or harming themselves, take what they say completely seriously and seek help immediately.

Suicidal thoughts or an acute mental health crisis? Get help now

  • Talk of wanting to die, or of being a “burden” on others
  • Severe hopelessness and a sense that there is no way out
  • Suddenly saying goodbye to family or giving away important belongings
  • Complete withdrawal and stopping eating or speaking
  • Severe agitation or going without sleep for days in a row, with impulsive, reckless behavior
  • Hearing voices that tell them to harm themselves or others

Stay with the person and do not leave them alone, listen without judgment or blame, and remove any dangerous objects from their reach. Call an ambulance (123) or go to the nearest emergency room, and you can call the mental health support line 16328 around the clock.

Ambulance 123 Mental health support line 16328
Frequently asked questions

Frequently asked questions about types of mental illness

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What are the best-known types of mental illness?

The most widespread are anxiety disorders and depression, followed by bipolar disorder, post-traumatic stress disorder and obsessive-compulsive disorder, then schizophrenia, personality disorders and attention-deficit/hyperactivity disorder.

What is the difference between mental illness and psychiatric illness?

In modern medical usage the two terms mean roughly the same thing, and the more precise one is “mental disorder.” In everyday speech, “mental illness” (as distinct from “psychological illness”) usually refers to psychotic conditions such as schizophrenia. This distinction is inaccurate and adds to stigma.

What proportion of people in the world have a mental illness?

According to the World Health Organization, about 1.2 billion people lived with a mental disorder in 2023, roughly one in seven.

Can a mental illness be completely cured?

Many conditions, such as episodes of depression and anxiety, improve completely with treatment, and some chronic disorders such as bipolar disorder and schizophrenia can be kept under control for many years with treatment and follow-up.

Is a visit to a psychiatrist confidential?

Yes. Confidentiality is fundamental in psychiatry and is guaranteed by Egyptian law. Information is disclosed only with the patient's consent or in specific cases defined by law.

What is the difference between DSM-5 and ICD-11?

The first is a diagnostic manual for mental disorders from the American Psychiatric Association, and the second is the international classification of all diseases from the World Health Organization. They are close for most diagnoses.

Can drugs cause mental illness?

Yes. Some substances can cause psychosis, depression or anxiety, and can bring out a latent illness in people predisposed to it, as happens in drug-induced psychosis.

How do I convince someone to see a psychiatrist?

Talk to them calmly about changes you have noticed, without accusing them. Link the visit to what troubles them, such as insomnia or tension, offer to go with them, and avoid threats or shaming.

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