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'''Depression''' is a mental illness that can affect mood, cognition, and physiological functioning. Each year about 21 million American adults (nearly 10% of the population) suffer from depression or a related illness<ref>Robins, L.N. & Regier, D.A. (1990). Psychiatric Disorders in America: The Epidemiologic Catchment Area Study. New York: The Free Press.</ref>. The primary symptoms of depression include feeling sad or melancholic and losing in interest in activities that are usually enjoyable. Depression can also include significant, unintentional weight loss; difficulty sleeping or oversleeping; restlessness; fatigue or loss of energy; feeling worthless or inappropriately guilty; difficulty thinking or concentrating; and thoughts of suicide<ref>American Psychiatric Association (1994). Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV). Washington, DC: American Psychiatric Association.</ref>.
== References ==
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== External Links ==
[http://www.nimh.nih.gov/publicat/depression.cfm National Institute of Mental Health]
== References ==
<references/>
== External Links ==
[http://www.nimh.nih.gov/publicat/depression.cfm National Institute of Mental Health]