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Here is a comprehensive overview of the major categories of psychiatric disorders, drawing from Kaplan & Sadock's Synopsis of Psychiatry and the Comprehensive Textbook of Psychiatry.

Psychiatric Disorders: Overview of Major Categories

Classification Framework

Psychiatric disorders are classified using the Diagnostic and Statistical Manual of Mental Disorders (DSM), currently in its 5th edition (DSM-5-TR), published by the American Psychiatric Association. The DSM uses a purely descriptive, symptom-based approach — it defines disorders by their observable clinical features rather than presumed cause.
Evolution of the DSM System
Evolution of the DSM from DSM-II (185 categories, 1968) to DSM-5 (>400 categories, 2013) — Kaplan & Sadock's Synopsis of Psychiatry
The parallel international system is the ICD-11 (WHO), which is used more widely outside North America.

Major DSM-5 Categories

1. Neurodevelopmental Disorders

Onset in early life; involve deficits in development of the brain and CNS.
  • Intellectual Disability (ID) — deficits in intellectual and adaptive functioning
  • Autism Spectrum Disorder (ASD) — impaired social communication, restricted/repetitive behaviors
  • ADHD — inattention and/or hyperactivity-impulsivity
  • Specific Learning Disorders — reading, writing, arithmetic
  • Tic Disorders / Tourette's

2. Schizophrenia Spectrum & Other Psychotic Disorders

Characterized by positive symptoms (hallucinations, delusions, disorganized speech/behavior) and negative symptoms (flat affect, alogia, avolition).
  • Schizophrenia — ≥6 months of symptoms; most severe and chronic
  • Schizophreniform Disorder — 1–6 months
  • Brief Psychotic Disorder — <1 month
  • Schizoaffective Disorder — psychosis + mood episode
  • Delusional Disorder — fixed, non-bizarre delusions without other psychotic features
African Americans and Latinos have been found to have over 3× higher odds of being diagnosed with schizophrenia compared to Whites — likely reflecting diagnostic bias and social determinants of health, not true biological difference. — Kaplan & Sadock's Comprehensive Textbook of Psychiatry

3. Bipolar & Related Disorders

Characterized by episodes of elevated or expansive mood.
  • Bipolar I — at least one full manic episode (with or without depression)
  • Bipolar II — hypomania + major depressive episodes (no full mania)
  • Cyclothymic Disorder — chronic fluctuating hypomania and depressive symptoms for ≥2 years

4. Depressive Disorders

Defined by persistent low mood, anhedonia, and neurovegetative symptoms.
  • Major Depressive Disorder (MDD) — ≥5 symptoms for ≥2 weeks including depressed mood or anhedonia
  • Persistent Depressive Disorder (Dysthymia) — chronic low-grade depression ≥2 years
  • Premenstrual Dysphoric Disorder (PMDD)
  • Disruptive Mood Dysregulation Disorder (DMDD) — children with recurrent severe temper outbursts

5. Anxiety Disorders

Excessive fear (response to immediate threat) and anxiety (anticipation of future threat).
  • Generalized Anxiety Disorder (GAD) — chronic, uncontrollable worry about multiple domains
  • Panic Disorder — recurrent unexpected panic attacks + anticipatory anxiety
  • Social Anxiety Disorder (Social Phobia)
  • Specific Phobia
  • Agoraphobia
  • Separation Anxiety Disorder

6. Obsessive-Compulsive & Related Disorders (OCD Spectrum)

  • OCD — intrusive obsessions + compulsive rituals to reduce distress
  • Body Dysmorphic Disorder
  • Hoarding Disorder
  • Trichotillomania (hair-pulling)
  • Excoriation Disorder (skin-picking)

7. Trauma- & Stressor-Related Disorders

  • PTSD — re-experiencing, avoidance, negative cognitions, hyperarousal after trauma
  • Acute Stress Disorder — similar to PTSD but lasting 3 days – 1 month
  • Adjustment Disorders — emotional/behavioral symptoms in response to identifiable stressor

8. Dissociative Disorders

  • Dissociative Identity Disorder (DID)
  • Dissociative Amnesia
  • Depersonalization/Derealization Disorder

9. Somatic Symptom & Related Disorders

  • Somatic Symptom Disorder — excessive distress/preoccupation with physical symptoms
  • Illness Anxiety Disorder (Hypochondriasis)
  • Conversion Disorder (Functional Neurological Symptom Disorder)

10. Feeding & Eating Disorders

  • Anorexia Nervosa — restriction + intense fear of gaining weight
  • Bulimia Nervosa — binge-purge cycles
  • Binge-Eating Disorder
  • ARFID (Avoidant/Restrictive Food Intake Disorder)

11. Sleep-Wake Disorders

  • Insomnia Disorder, Hypersomnolence, Narcolepsy, OSA, Parasomnias (REM sleep behavior disorder, sleepwalking), Circadian Rhythm disorders

12. Substance Use & Addictive Disorders

  • Alcohol, cannabis, stimulant, opioid, sedative, hallucinogen, tobacco, gambling disorder
  • Defined by impaired control, social impairment, risky use, and pharmacological criteria (tolerance, withdrawal)

13. Neurocognitive Disorders

  • Delirium — acute, fluctuating disturbance in attention and cognition
  • Major Neurocognitive Disorder (Dementia) — Alzheimer's, Lewy body, frontotemporal, vascular
  • Mild Neurocognitive Disorder (MCI)

14. Personality Disorders

Enduring, inflexible patterns of inner experience and behavior deviating from cultural norms, causing distress or impairment. Grouped into three clusters:
ClusterCharacterDisorders
A — "Odd/Eccentric"Distorted thinkingParanoid, Schizoid, Schizotypal
B — "Dramatic/Erratic"Emotional dysregulationAntisocial, Borderline, Histrionic, Narcissistic
C — "Anxious/Fearful"Anxiety-drivenAvoidant, Dependent, Obsessive-Compulsive

15. Other Notable Categories

  • Paraphilic Disorders (Voyeuristic, Exhibitionistic, Pedophilic, etc.)
  • Disruptive, Impulse-Control & Conduct Disorders (ODD, Conduct Disorder, Intermittent Explosive Disorder, Pyromania, Kleptomania)
  • Gender Dysphoria

Key Historical Context

The DSM-III (1980) was a turning point — it eliminated assumed etiology and introduced symptom-based, operationalized criteria for reliability. This enabled rigorous clinical research and the predominance of CBT and pharmacotherapy as evidence-based treatments. DSM-5 (2013) added dimensional spectra, cross-cutting symptom measures, and cultural/developmental sensitivity.
"Most psychiatric disorders are very complex disorders that require multifaceted solutions... including attention to psychosocial treatments as well as pharmacologic." — Kaplan & Sadock's Synopsis of Psychiatry
Would you like a deeper dive into any specific category — its diagnosis, neurobiology, or treatment?
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