dysthymia

noun

1. (uncountable, usually)A tendency to be depressed, without hope.
2. (uncountable, usually)A form of clinical depression, characterized by low-grade depression which lasts at least two years.

   “For diagnostic, research, and treatment reasons, a distinction should always be made between the milder dysthymias, atypical and hysteroid depressions, and the more serious major depressive illnesses, with and without melancholic (vegetative) and psychotic features.”

   “A decade ago most psychiatrists would have been puzzled to find a chapter on dysthymia in a book about severe depressive disorders. They would have characterized this chronic form of depression as mild, "minor," or "syndromal."[…]In recent years, research has demonstrated the severity, prevalence, and importance of vogorous antidepressant treatment of dysthymia, justifying its inclusion here among serious mood disorders.”

   “In other patients, the dysthymia may co-occur with but not be causally related to the ADHD (Adler and Cohen 2004).[…]Early studies of adults with ADHD found rates of dysthymia as high as 67%–81% (Wender et al. 1985).”

   “Dysthymia in childhood or adulthood also significantly increases the risk of developing a subsequent major depressive episode.”

   “Involutive depression or bipolar dysthymias must be ruled out.[…]Two characteristics of bipolar dysthymias are distinguishable: first, the bipolar disorders are cyclical in character and develop over several days to several weeks, which is quite different from the sudden and sometimes multiple changes of chronic depression; second, the productive phases of dysthymias are accompanied by a considerable decrease in the duration of sleep, to less than 6 hours per day.”