Cyclothymic Disorder Familial Pattern
Major Depressive Disorder and Bipolar I or II Disorder appear to be more common among first-degree biological relatives of persons with Cyclothymic Disorder than among the general population. There may also be an increased familial risk of Substance-Related Disorders. In addition, Cyclothymic Disorder may be more common in the first-degree biological relatives of individuals with Bipolar I Disorder.