Dysthymia
The Greek word dysthymia means “bad state of mind” or “ill humor.” As one of the two chief forms of clinical depression, it usually has fewer or less serious symptoms than major depression but lasts longer.
The American Psychiatric Association defines dysthymia as depressed mood most of the time for at least two years, along with at least two of the following symptoms: poor appetite or overeating; insomnia or excessive sleep; low energy or fatigue; low self-esteem; poor concentration or indecisiveness; and hopelessness.
Dysthymia and major depression naturally have many symptoms in common, including depressed mood, disturbed sleep, low energy, and poor concentration. There are also parallel symptoms: poor appetite, low self-esteem, and hopelessness in dysthymia, corresponding to the more severe symptoms of weight change, excessive guilt, and thoughts of death or suicide in major depression.
Major depression may also include two symptoms not found in the standard definition of dysthymia: anhedonia (inability to feel pleasure) and psychomotor symptoms (chiefly lethargy or agitation). An episode of major depression requires at least five symptoms instead of three, but it need last only two weeks rather than two years.
Source: February 2005 issue of the Harvard Mental Health Letter
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