What are the signs and symptoms of clinical depression?

Major Depression: Symptoms include guilt, feelings of sadness or unhappiness, irritability or frustration, loss of interest or pleasure in normal activities, reduced sex drive, insomnia or excessive sleeping, change in appetite, restlessness, slowed thinking, speaking or body movements, indecisiveness, and suicidal thoughts.

Clinical Depression: Sad affect, tearful, no joy in activities, feeling worthless/hopeless/helpless, ruminate about death/suicide, neurovegetative symptoms (appetite, sleep, energy changes), poor concentration/memore, withdrawal, reduced sex drive.

2 general types: Generally there are two types of depression. The first is dysthymia, which is a chronic type of depression that varies little in intensity, and major depression, which varies in intensity a great deal.