Bipolar disorder is a mood disorder characterized by periods of depression and periods of mania or hypomania. During manic or hypomanic periods, people experience hyperactivity, impulsivity, and overly optimistic or irritable moods. Depressive periods involve symptoms of major depression like difficulty concentrating and suicidal thoughts. Bipolar disorder can be difficult to diagnose and treatment often involves medication and therapy to help manage mood swings and related issues like anxiety or substance abuse. Living with bipolar disorder is challenging but possible to do successfully with proper treatment and lifestyle habits.