What are the common symptoms of Bipolar Disorder?

Classic Bipolar Disorder (or Bipolar Disorder I) is characterised by episodes of mania and episodes of depression. In a Manic State, a person may have extreme euphoria or optimism, to the point of impairing judgement. They may be hyperactive and stay up all night, talk and move extremely fast, have increased sexual drive and decreased inhibition. 75% of manic episodes include delusions of some sort (most often delusions of grandeur), one of the reasons why it is sometimes confused with schizophrenia. Untreated manic episodes can last for weeks or even months. Conversely, during a depressive episode, the same person can feel hopeless and personally worthless. They may lose interest in their normal activities (including sex), have very little energy or motivation, be unable to concentrate, and have disturbances in sleep and eating habits.  more