Dysthmia is a type of chronic, more mild depression. More days than not, you feel mildly or moderately depressed, although you may have brief periods of normal mood. The symptoms of dysthymia are not as strong as the symptoms of major depression, but they last much longer. Some people also experience major depressive episodes on top of dysthymia, a condition known as “double depression.” If you suffer from dysthymia, you may feel like you have always suffered from depression. Or you may think that your continuous depressed state is just “normal.” However, dysthymia can be treated, even if your symptoms of depression have gone untreated for years.