This document discusses bipolar disorder and related topics. It defines bipolar disorder as a mental illness involving extreme fluctuations in mood between mania and depression. Individuals with bipolar disorder experience manic episodes lasting at least a week with abnormally elevated mood and energy levels that impair functioning, as well as depressive episodes involving extreme sadness. The document outlines characteristics of bipolar disorder like mood episodes and types. It also discusses measures for assessing depression and treatments for bipolar disorder such as medications, electroconvulsive therapy, cognitive restructuring, and rational emotive behavioral therapy.