Concept

Persistent Depressive Disorder

Persistent Depressive Disorder (PDD), formerly known as dysthymia, is a chronic form of depression diagnosed when an individual experiences a depressed mood for most of the day, on more days than not, for a minimum of two years. In addition to the persistent low mood, a diagnosis requires at least two other symptoms of major depressive disorder. Individuals with PDD are chronically sad and melancholic, but their symptoms do not meet the full criteria for a major depressive episode. However, it is possible for someone with PDD to also experience periods of full-blown major depressive disorder.

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Updated 2025-10-10

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