Bipolar 1:
The person has manic or mixed episodes as well as depression.
Bipolar 2:
The person only has one or more depressive episodes with at least one hypomanic episode. For some, hypomanic episodes are not severe enough to cause severe impairment in functioning.
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When four or more episodes of illness occur within a year, the person is said to have bipolar disorder with rapid cycling.
Cyclothymic disorder
This is characterised by chronic fluctuating moods involving periods of hypomania and depression.
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