This document discusses chronic depression, including its symptoms, causes, risk factors, diagnosis, and treatment options. Chronic depression is a mood disorder that causes feelings of sadness, lack of interest, and other emotional and physical problems. It has several subtypes depending on additional symptoms experienced. Diagnosis involves psychological evaluation and may include medical tests. Treatment typically involves medications, psychotherapy, lifestyle changes, and in severe cases, hospitalization or electroconvulsive therapy. Major depressive disorder affects about 15% of Americans at some point in their lives.