http://www.nia.nih.gov/HealthInformation/Publications/depression.htm
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National Institute on Aging Information Center
Everyone gets the blues now and then. It's part of life. But if you feel little joy or pleasure after visiting with friends or seeing a good movie, you may have a more serious problem. Being depressed for a while, without letup, can change the way you think and feel. Doctors call this clinical depression.