According to the diagnosis manual DSM-IV's definition of dysthymia, it is a serious state of chronic depression, which persists for at least 2 years (1 year for children and adolescents); it is less acute and severe than major depressive disorder.[4] As dysthymia is a chronic disorder, sufferers may experience symptoms for many years before it is diagnosed, if diagnosis occurs at all. As a result, they may believe that depression is a part of their character, so they may not even discuss their symptoms with doctors, family members, or friends

http://en.m.wikipedia.org/wiki/Dysthymia



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