This document discusses bipolar disorder, also known as manic depression. It is a mental illness characterized by periods of depression and mania. There are different types of bipolar disorder defined by the severity and frequency of mood episodes. While the causes are unclear, it is thought to involve imbalances in brain chemicals and may be influenced by genetic and environmental factors. Diagnosis involves evaluating mood symptoms and ruling out other potential causes. Treatment includes mood stabilizing medications, psychotherapy, and lifestyle management to control symptoms and minimize relapse.