Dysthymia is the medical name for chronic or long-term, mild depression. Dysthymia may be chronic but it’s less severe with fewer symptoms than major depression. Dysthymia symptoms may occur for two years or more, and the disorder may include some periods of major depression. When this happens, it’s known as double depression.
For diagnostic purposes, dysthymia and chronic depression are characterized as persistent depressive disorders. Find information about dysthymia by searching these related topics.