A mood disorder which the person alternates between the hopelessness and lethargy of depression and the overexcited state of mania.
Psychotic disorder
A psychological disorder in which a person loses contact with reality, experiencing irrational ideas and distorted perceptions.
Medical model
The concept that diseases have physical causes that can be diagnosed, treated, and, in most cases, cured. When applied to psychological disorders, the medical model assumes that these "mental" illnesses can be diagnosed on the basis of their symptoms.
Neurotic disorder
A psychological disorder that is usually distressing but that allows one to think rationally and function socially.
Obsessive-compulsive disorder
An anxiety disorder characterized by unwanted repetitive thoughts (obsessions) and / or actions (compulsions).
Panic disorder
An anxiety disorder marked by minutes-long episode of intense dread in which a person experiences terror and accompanying chest pain, choking, or other frightening sensations.
Dissociative identity disorder
A rare dissociative disorder in which of person exhibits two or more distinct and alternating personalities.
Anxiety disorder
Psychological disorders characterized by distressing, peristent anxiety or maladaptive behaviors that reduce anxiety.
Delusions
False beliefs, often of persecutions or grandeur, that may accompany psychotic disorders.
Manic episode
A mood disorder marked by a hyperactive, wildly optimist state.
