There are two main types: bipolar 1 disorder and bipolar 2 disorder. Bipolar 1 disorder: This type requires at least one episode of mania, but typically also includes episodes of depression and hypomania. In severe cases, the mania or depression may include psychosis, in which you feel, see or hear something that is not there. Bipolar 2 disorder: This type had at least one major depressive episode and at least one hypomanic episode. Depressive episodes are often more common than hypomanic episodes. Bipolar 2 disorder is not a less severe version of bipolar 1 disorder.