Based on the variation in the frequency and severity of symptoms, bipolar disorder is categorized into following types:

1. Bipolar I Disorder

People suffering from Bipolar I disorder may have other mental conditions such as Attention Deficit Hyperactivity Disorder (ADHD), substance abuse and anxiety disorder.

2. Bipolar II Disorder

This variant of bipolar disorder, shows features of depressive episodes and hypomanic episodes, without a full-blown manic episode. Bipolar II disorder can be a life-threatening condition as the depressive episode may be severe enough to necessitate medical help.

3. Cyclothymic Disorder

It is a mild form of bipolar disorder, characterized by several episodes of depression and hypomania. A person is said to have cyclothymic disorder, when the following symptoms are experienced.

4. Other specified and unspecified bipolar and related disorders

This includes clinical cases where bipolar symptoms do not match symptoms of any of the three types mentioned above.
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replied July 12th, 2018
Experienced User
Bipolar I is characterized by one or more manic episodes or mixed episodes. Typically a person will experience periods of depression as well. Bipolar I disorder is marked by extreme manic episodes.

Bipolar II disorder is diagnosed after one or more major depressive episodes and at least one episode of hypomania, with possible periods of level mood between episodes.
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