AP PSYCHOLOGY

Detailed explanation-1: -About 5.7 million Americans ages 18 and older suffer from bipolar disorder, according to the National Institute of Mental Health (NIMH). An equal number of men and women develop bipolar disorder, and it is found in all ages, races, ethnic groups and social classes.

Detailed explanation-2: -46 million people around the world, including 2.8% of the U.S. population, have bipolar disorder. See more bipolar statistics here. What does it feel like to have bipolar disorder?

Detailed explanation-3: -About 1 in 40 American adults live with bipolar disorder. About 1% of American teenagers live with bipolar disorder. Unlike many other mental illnesses, bipolar disorder affects men and women equally.