In DSM-IV, a group of mood disorders that includes major depressive disorder
(single episode or recurrent); dysthymic disorder; and depressive disorder not
otherwise specified (NOS).
- major depressive disorder (in other classificatory systems called major
depression; manic depressive disorder, depressed) occurs in a person who has
never had an episode of mania and is characterized by significant lowering of
the mood tone and loss of interest or pleasure in daily activities, plus a range
of other symptoms that may include significant weight and appetite changes,
insomnia or hypersomnia, psychomotor agitation or retardation, fatigue or loss
of energy, feelings of worthlessness or excessive and inappropriate guilt,
diminished ability to think or concentrate, indecisiveness, and recurrent
thoughts of death or suicide. Some patients have only a single episode, whereas
others have recurrent episodes of depression.
- depressive disorder not otherwise specified (NOS) includes premenstrual
dysphoric disorder and postpsychotic depression of schizophrenia.