According to the American Psychiatric Association, there are four main categories of bipolar disorder: Bipolar I disorder: In these manic episodes last for at least seven days and have psychotic or manic symptoms. Episodes usually last for two weeks and pose more of the depressive features. Bipolar II disorder: It is characterized by one hypomanic episode and one major depressive episode in your lifetime. Common symptoms in the major depressive episode of bipolar II disorder include insomnia or hypersomnia, severe fatigue, uncontrollable crying, recurring death thoughts, or suicidal thoughts. Cyclothymic disorder: It is the middle form of bipolar disorder. It consists of mood swings. It usually develops in adolescence. They function normally but may appear moody or difficult to others. Bipolar disorder due to another medical or substance abuse disorder: It does not have any specific pattern like the ones mentioned above.