Dysthymic Disorder is characterised by a persistently depressed mood experienced most of the time over a long period (often at least two years), along with some of the following symptoms: insomnia or excessive sleep, low energy or fatigue, low self-esteem, poor appetite or overeating, poor concentration or indecisiveness, and feelings of hopelessness.

Symptoms of dysthymia are typically less severe than those of major depression. However, people suffering from Dysthymic Disorder often find that its symptoms, while not disabling, prevent them from functioning normally or feeling good. Many individuals with dysthymia also experience major depressive episodes at some point in their lives.