This document provides information about bipolar disorder from several sources. It begins with an introduction that bipolar disorder causes unusual shifts in mood and affects day-to-day tasks. Several key points are then summarized: bipolar disorder was formerly called manic depressive illness; symptoms include feeling unusually high, grandiose beliefs, or deeply depressed; and potential causes may include genetics and biological brain differences. Treatment options like medications, therapy, and lifestyle changes are discussed. The role of society, true stories of those affected, and prevention strategies are also covered briefly.