Bipolar I disorder

Bipolar disorder that is characterized by at least one manic or mixed episode

Bipolar I disorder (also referred to as BD-I or type one bipolar disorder) is a type of bipolar spectrum disorder characterized by the occurrence of at least one manic episode. Symptoms of bipolar I disorder typically begin at 15–25 years of age, with depression being the most common initial symptom. People may also have one or more depressive episodes.

From Wikipedia, under CC BY-SA. More on occurri.