Bipolar I disorder

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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. Typically, manic episodes can last at least 7 days for most of each day to the extent that the individual may need medical attention, while the depressive episodes last at least 2 weeks. The prevalence of bipolar disorders is about 1% worldwide. Bipolar I disorder is associated with higher rates of comorbid medical illness.

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