Cyclothymic Disorder is defined by the presence of both hypomanic and depressive symptoms without fulfilling the criteria for a distinct episode of mania, hypomania, or major depression. These symptoms must persist for over two years (or one year for children & adolescents).

Syracuse University

The DSM-5-TR separates Bipolar and Related Disorders into the following specific disorders:
- Bipolar I Disorder
- Bipolar II Disorder
- Cyclothymic Disorder
- Substance/Medication-Induced Bipolar and Related Disorder
- Bipolar and Related Disorder Due to Another Medical Condition
- Other Specified Bipolar and Related Disorder
- Unspecified Bipolar and Related Disorder
- Unspecified Mood Disorder


[DSM-5-TR] List of Bipolar and Related Disorders

National Institute of Mental Health . (n.d.). Bipolar disorder. Bipolar Disorder. Retrieved January 27, 2022, from https://www.nimh.nih.gov/health/topics/bipolar-disorder 

Bipolar Disorder

American Psychiatric Association. (2013). Diagnostic and statistical manual of mental disorders (5th ed., Text revision). https://doi.org/10.1176/appi.books.9780890425596

DSM-5-TR

Bipolar I Disorder is distinguished by the experience of a fully syndromal manic episode or manic symptoms that are severe enough to require immediate hospitalization at least once within the patient’s lifetime. Usually the patient will experience depressive episodes or symptoms as well, typically qualifying for a major depressive episode, though not always. Episodes of depression with mixed features (i.e.., having depressive and manic symptoms at the same time) are also possible. 

Bipolar I Disorder

Cyclothymic Disorder

Bipolar II Disorder is defined by the occurrence of at least one major depressive episode and at least one hypomanic episode. A key diagnostic requirement is that the patient must have no history of a full manic episode. The combination of major depressive symptoms and resulting mood instability typically causes significant impairment in the individual's daily functioning.

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