The main categories of mental illness are:

Neurodevelopmental disorders
 This category covers a wide range of problems that usually begin at the age of breastfeeding or childhood, often before a child starts elementary schoolExamples include autism spectrum 
disorder, attention deficit disorder with hyperactivity (ADHD), and learning disorders.

Schizophrenia spectrum and other psychotic disorders
 Mental disorders cause a break with reality - such as delusions, hallucinations, disorganized thinking and speechThe most prominent example is schizophrenia, although there are other classes of disorders that can sometimes be associated with separation from reality.

Bipolar disorder and associated disorders
This category includes disorders with alternating episodes of mania - periods of hyperactivity, energy and excitement - and depression.

Depressive disorders
 It includes these disturbances that affect your emotional feelings, such as the level of sadness and happiness, and can impair your ability to workExamples include severe depression disorder and premenstrual dysphoric disorder.

Anxiety disorders
Anxiety is an emotion characterized by anticipation of danger or distress in the future, along with excessive anxietyIt can include behavior intended to avoid anxiety-causing situationsThis category includes generalized anxiety disorder, panic disorder, and phobias.

Obsessive-compulsive disorder and associated disorders 
These disturbances involve preoccupation or obsessions, repetitive thoughts and actionsExamples include obsessive-compulsive disorder, compactness disorder, and trichotillomania.

Shocks and stress related disorders
These are the adaptive disorders that a person has trouble coping with during or after stressful life eventsExamples include post-traumatic stress disorder (PTSD) and acute stress disorder.

Schizophrenic disorders
These are disorders in which your sense of self is impaired, such as dissociative identity disorder and schizophrenic amnesia.

Physical symptoms and associated disorders
A person with one of these disorders may have physical symptoms that cause major emotional disorders and work problemsThere may or may not be another diagnostic medical condition associated with these symptoms, but the reaction to the symptoms is abnormalDisorders include physical symptoms disorder, pathological anxiety disorder and fabricated disorder.

Nutritional disorder and appetite disorder 
It includes eating-related disorders that affect nutrition and health, such as anorexia nervosa and an eating disorder.

Disposal disorders 
These disorders relate to improper disposal of urine or stools by accident or on purposeBed wetness (enuresis) is an example.

Sleep and wake disorders
 These sleep disorders are severe enough to require clinical care, such as insomnia, sleep apnea and restless legs syndrome.

Sexual dysfunctions
 It includes sexual response disorders, such as premature ejaculation and female orgasmic disorder.

Behavioral, impulsive, and obstructive disorders
 These disorders include emotional and behavioral control problems, such as theft mania or intermittent explosive disorder.

Addiction disorders and substance abuse
 Problems associated with excessive use of alcohol, caffeine, tobacco and drugsThis category also includes gambling disorder.

Cognitive disorders
 Cognitive disturbances affect your ability to think and perceiveThese include cognitive problems (not developmental) delirium, as well as neurocognitive disorders due to conditions or diseases such as traumatic brain injury or Alzheimer's disease.

Personality disorders
 Personality disorder implies a persistent pattern of emotional instability and unhealthy behavior that causes problems in your life and relationshipsExamples include borderline, anti-social, and narcissistic personality disorders.