Types of Bipolar Disorder

According to all of the research people and science stuff,  these are the basic types of bipolar disorder:

1. Bipolar I Disorder   -  defined by manic or mixed episodes that last at least seven days, or by manic symptoms that are so severe that the person needs immediate hospital care. Usually, depressive episodes occur as well and usually last about  2 weeks.
2. Bipolar II Disorder  -  defined by a pattern of depressive episodes and hypomanic episodes, but no full-blown manic or mixed episodes.
3. Bipolar Disorder Not Otherwise Specified (BP-NOS)  -  diagnosed when symptoms of the illness exist but the symptoms do not meet diagnostic criteria to be classified as  bipolar I or bipolar II. However, the symptoms are clearly out of the person's normal range of behavior.
4. Cyclothymic Disorder, or Cyclothymia  -  a mild form of bipolar disorder. People with cyclothymia have episodes of hypomania as well as mild depression for at least 2 years. However, the symptoms do not meet the diagnostic requirements for any other type of bipolar disorder.
5. Rapid-cycling Bipolar Disorder - A severe form of the disorder.  Rapid cycling occurs when a person has 4 or more episodes of major depression, mania, hypomania, or mixed states, within a year. Rapid cycling seems to  affect people who had their first bipolar episode at a younger age.