This document discusses two types of persistent mood disorders: dysthymia and cyclothymia. It defines dysthymia as a chronic mild depression lasting at least two years in adults or one year in children. Cyclothymia is characterized by alternating periods of mild depression and hypomania, separated by brief periods of normal mood. The document covers the epidemiology, etiology, clinical features, diagnosis, treatment including psychotherapy and medications, and health education recommendations for these two persistent mood disorders.