The following is a list of mental disorders as defined by the Diagnostic and Statistical Manual of Mental Disorders (DSM) and the International Classification of Diseases (ICD). The DSM is the American Psychiatric Association's standard reference for psychiatry, which includes over 450 different definitions of mental disorders. The ICD published by the World Health Organization is the international standard system for classifying all medical diseases. It also includes a section on mental and behavioral disorders. The diagnostic criteria and information in the DSM and ICD are revised and updated with each new version. This list contains conditions which are currently recognized as mental disorders as defined by these two systems. There is disagreement in various fields of mental health care, including the field of psychiatry, over the definitions and criteria used to delineate mental disorders. Of concern to some professionals is whether certain mental disorders should be classified as "mental illnesses" or whether they would be better described as neurological disorders, or in other ways. Anxiety disorders Separation anxiety disorder Specific phobia Social anxiety disorder Panic disorder Agoraphobia Generalized anxiety disorder Selective mutism Dissociative disorders Dissociative identity disorder Dissociative amnesia (psychogenic amnesia) Depersonalization-derealization disorder Dissociative fugue Dissociative neurological symptom disorder (this includes Psychogenic non-epileptic seizures) Other specified dissociative disorder (OSDD) Unspecified dissociative disorder Ganser syndrome Mood disorders Depressive disorders Disruptive mood dysregulation disorder Major depressive disorder Dysthymia Premenstrual dysphoric disorder Psychotic depression Seasonal affective disorder (SAD) Atypical depression Postpartum depression Bipolar disorders Bipolar I disorder Bipolar II disorder Bipolar disorder not otherwise specified Cyclothymia Trauma and stressor related disorders Reactive attachment disorder Disinhibited social engagement disorder Post-traumatic stress disorder (PTSD) Acute stress disorder Adjustment disorder Complex post-traumatic stress disorder (C-PTSD) Prolonged grief disorder Neuro-developmental disorders Intellectual disability Language disorder Speech sound disorder Stuttering Social communication disorder Communication disorder Autism spectrum disorder (formally a category that included Asperger syndrome, Classic autism and Rett syndrome) Attention deficit hyperactivity disorder (ADHD) Developmental coordination disorder Tourette syndrome Tic disorder Dyslexia Dyscalculia Dysgraphia Nonverbal learning Disorder (NVLD, NLD) Sleep-wake disorders Insomnia (including chronic insomnia and short-term insomnia) Hypersomnia Idiopathic hypersomnia Kleine–Levin syndrome Insufficient sleep syndrome Narcolepsy Restless legs syndrome Sleep apnea Night terrors (sleep terrors) Exploding head syndrome Parasomnias Nightmare disorder Rapid eye movement sleep behavior disorder Confusional arousals Sleepwalking Hypnagogic hallucinations Hypnopompic hallucinations Circadian rhythm sleep disorder Circadian rhythm sleep disorder Delayed sleep phase disorder Advanced sleep phase disorder Irregular sleep–wake rhythm Non-24-hour sleep–wake