Another type of depression is bipolar disorder, otherwise known as manic-depressive illness. Occurring less frequently than major depressive disorder, bipolar disorder is distinguished by cycling mood changes: profound highs (mania) and lows (depression). Sometimes shifts in mood are pronounced and rapid, but typically they occur gradually. When experiencing the depressed cycle, an individual can have any or all of the symptoms of a depressive disorder. When in the manic stage, the individual may experience physical and emotional agitation, exhibit pressured speech, and have an overabundance of energy. Mania often distorts thinking, judgment, and social behavior in manners causing distress and embarrassment. Examples include feelings of elation, which can be expressed as risky business decisions or erratic romantic and sexual encounters. If left untreated, mania can deteriorate to a psychotic state.