1. Depressed Teens Continue to Suffer - US News and World Report
Those with mild depression more likely to suffer major episode later, researchers say

2. Depression  (Trust Mark: Doctor-Reviewed)
Depression may be described as feeling sad, blue, unhappy, miserable, or down in the dumps. Most of us feel this way at one time or another for short periods. True clinical depression is a mood disorder in which feelings of sadness, loss, anger, o...• Reviewer: Paul Ballas, DO, Department of Psychiatry, Thomas Jefferson University Hospital, Philadelphia, PA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

3. Bipolar disorder  (Trust Mark: Doctor-Reviewed)
Bipolar disorder involves periods of excitability (mania) alternating with periods of depression. The "mood swings" between mania and depression can be very abrupt.• Reviewer: Christos Ballas, MD, Attending Psychiatrist, Hospital of the University of Pennsylvania, Philadelphia, PA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.