One method of understanding and treating bipolar disorder better is classifying it into separately comprehensible and treatable types. The three types of bipolar disorder differ mainly in the degree to which they exhibit episodes of depression and mania. There are also nuances of behavior that can be described within these types.
Bipolar I Disorder–Bipolar I disorder is a mental illness characterized by the severity of mood swings from mania to depression and back again. To be diagnosed with bipolar I disorder a person must have experienced a minimum of one manic episode. Their behavior in all likelihood during their one or more episodes served to completely disrupt their life.
Experiencing profound depression is also a typical part of life for people with bipolar I disorder. People with bipolar I disorder frequently cycle between the two extreme moods of depression and mania. Hence the older term “manic-depression”. It should noted, as well, that these peoples’ extreme mood swings do not preclude their experiencing prolonged periods of perfectly normal psychological states between their mood swings.
Bipolar II Disorder–Bipolar II disorder is a mental illness that resembles the more severe form of bipolar disorder known as bipolar I disorder. Their moods cycle between mania and depression over the course of time. What distinguishes bipolar II from bipolar I disorder is that the manic or up moods cannot be described as full-on or complete mania. Their highs are labeled with the term hypomania. To be diagnosed with bipolar II disorder a person must have experienced a minimum of one hypomanic episode. People with this disorder are also prone to suffering episodes of depression. Periods hypomania nor depression do not make up the entire live of these persons. They can live lives that are free of the behaviors and symptoms of bipolar II disorder for extended periods of time.
Where Does Something Called Cyclothymia Fit in?
The mental illness labeled cyclothymia can be thought of as relatively mild mood disorder. Its mood swings don’t attain the extreme peaks and valleys of major depression or mania. Researchers estimate that up to 1% of people in the U.S. have cyclothymia. Because it is a milder form of mental illness the onset of cyclothymia can be difficult to identify. Symptoms usually begin occurring in adolescence. The pattern mood swings is irregular and unpredictable. Mood variations are part of a normal psychological makeup and it can prove hard to distinguish cyclothymia. People with cyclothymia can cycle continuously from hypomanic to depressed, without a normal period in between. They are almost as likely to exhibit extended periods of depression or hypomania. Most experts have concluded that cyclothymic disorder is an extremely mild form of bipolar disorder.
All the different types of bipolar disorders exhibit variations within their types. Duration and frequency are the distinguishing characteristics. Both mania and depression can be seen to exist in the same person at the same time. Rapidly cycling bipolar disorders are marked by four or more episodes occurring within a year. In fact many more can occur, much more frequently. Persons with these symptoms are at greater risk for suicide.

