Persistent depressive disorder (PDD) is a form of chronic depression. It’s a relatively new diagnosis that combines the two earlier diagnoses dysthymia and chronic major depressive disorder. Like other types of depression, PDD causes continuous feelings of deep sadness and hopelessness. These feelings can affect your mood and behavior as well as physical functions, including appetite and sleep. As a result, people with the disorder often lose interest in doing activities they once enjoyed and have difficulty finishing daily tasks.

These symptoms are seen in all forms of depression. In PDD, however, the symptoms are less severe and longer lasting. They can persist for years and may interfere with school, work, and personal relationships. The chronic nature of PDD can also make it more challenging to cope with the symptoms. However, a combination of medication and talk therapy can be effective in treating PDD.