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Evidence-Based Supplement Research
Evidence-Based Supplement Research

Dysthymia

Dysthymia, also known as persistent depressive disorder (PDD), is a chronic type of depression characterized by a depressed mood on most days for at least 2 years (1 year for children and adolescents) and involves similar cognitive and physical problems as major depressive disorder, but with longer-lasting symptoms. The term was introduced by Robert Spitzer in the late 1970s as a replacement for "depressive personality."
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