About 45 million people around the world have bipolar disorder. In the United States alone, around seven million adults live with the disorder. That's about 2.8 percent of the population. Bipolar Disorder explains that the disorder has a serious impact on the lives of those who are affected by it. It reveals that people with bipolar disorder experience emotions far more intensely than other people, having periods of high energy and euphoria followed by episodes of depression. Readers will learn that episodes can last days or even weeks, and these periods have a huge impact on what people say, think, feel, and do.