What disorder consists of fluctuations between episodes of depression and mania?

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Bipolar I disorder is characterized by the occurrence of at least one manic episode, which may be preceded or followed by a hypomanic or depressive episode. This disorder involves fluctuations between episodes of depression and mania. Bipolar II disorder, by contrast, involves at least one hypomanic and one depressive episode but not a full-blown manic episode. Major depression is characterized by persistent feelings of sadness, hopelessness, and a lack of interest in formerly enjoyable activities. Dysthymia, also known as persistent depressive disorder, involves chronic low mood but without the presence of major depressive episodes.

What Disorder Consists of Fluctuations Between Episodes of Depression and Mania