This is a mental illness. It is a state of ellevated abnormally mood, arousal, and energy levels. It is the opposite of depression. The word derives from the Greek word meaning "madness" or "to be mad, to rage, to be furious".

In addition to mood disorders, individuals may exhibit manic behavior as a result of drug intoxication, medication side effectsor malignancy. Mania is most often associated with bipolar disorder, where episodes of mania may alternate with episodes of major depression.

It is vital that mania is predicted in the early stages because the patient becomes reluctant to comply to the treatment. These cycles are often affected by changes in sleep cycle (too much or too little), diurnal rhythms and environmental stressors.