An affective disorder characterized by a dysphoric mood,usually depression,or loss of interest or pleasure in almost all usual activities or pastimes is

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The defining feature of major depression is a dysphoric mood, loss of interest or pleasure in almost all activities, and other symptoms such as sleep disturbances, changes in appetite, feelings of worthlessness or guilt, and thoughts of death or suicide. Bipolar disorder involves episodes of both depression and mania, schizophrenia involves symptoms such as delusions and hallucinations, and mental retardation is a developmental disorder characterized by disability in intellectual functioning.

An Affective Disorder Characterized by a Dysphoric Mood,usually Depression,or Loss