Associated descriptive features and mental disorders. Substance-Related Disorders and Sleep Disorders (i.e., difficulties in initiating and maintaining sleep) may be present.
Specific Age and Gender Features
Cyclothymic Disorder often begins early in life and is sometimes considered to reflect a temperamental predisposition to other Mood Disorders (especially Bipolar Disorders). In community samples, Cyclothymic Disorder is apparently equally common in men and in women. In clinical settings, women with Cyclothymic Disorder may be more likely to present for treatment than men.
Studies have reported a lifetime prevalence of Cyclothymic Disorder of from 0.4% to 1%. Prevalence in mood disorders clinics may range from 3% to 5%.
Cyclothymic Disorder usually begins in adolescence or early adult life. Onset of Cyclothymic Disorder late in adult life may suggest a Mood Disorder Due to a General Medical Condition such as multiple sclerosis. Cyclothymic Disorder usually has an insidious onset and a chronic course. There is a 15%-50% risk that the person will subsequently develop Bipolar I or II Disorder.