The types of bipolar disorders are I, II and cyclothymic. Other types include bipolar disorders owing to medical conditions, such as stroke, multiple sclerosis and Cushing’s disease, and substance- or medication-induced bipolar and related disorders, states Mayo Clinic.
Bipolar I disorder describes periods of acute mood episodes ranging from mania to depression. Bipolar II entails milder hypomanic episodes that alternate with periods of major depression, notes WebMD. Cyclothymic involves phases of hypomania symptoms with shorter periods of depression but no hypomanic episodes.
A manic episode is a distinctive period marked by hyperactivity and an elated mood lasting at least a week. A hypomanic episode is a milder form of manic and lasts for at least four consecutive days, according to Mayo Clinic.