Severe depression that comes on suddenly or seems to have no external cause is called ______.

Name: Severe depression that comes on suddenly or seems to have no external cause is called ______.
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Major depression is characterized by a sudden onset or a lack of a clear external cause, as opposed to dysthymia, which is a chronic, low-grade form of depression. Bipolar disorder involves cycles of depression and mania, while hypomania is a milder form of mania.

Severe Depression That Comes on Suddenly or Seems to Have