Bipolar I disorder: You experience at least one manic episode and one major depressive episode, or you're very irritable and have severe changes in your mood and energy level (mood swings) that cause problems in relationships or at work.   2. Bipolar II disorder: The mood cycle for Bipolar II can go from low to high and back to low again. Hypomania is a milder state of high energy and euphoria. Depressive symptoms are not present in a complete manic experience. The duration of hypomania is usually at least four days; however, at a minimum, there must be an increase in energy level, and the individual must feel good or even high. The individual may talk fast, move quickly, and have difficulty sleeping; however, they do not feel pressured to perform or cannot control their urge to work or other activities.   3. Cyclothymic disorder is a kind of bipolar disorder. Cyclothymic bipolar disorder involves mood changes that are less severe than those found with other forms of bipolar disorder.   4. Unspecified bipolar disorder is a diagnosis used when the patient has had symptoms of both mania and depression, but there is not enough information to make a specific diagnosis.