Bipolar disorder also known as manic-depressive illness, is believed to affect about 1% to 3% of the population, and is characterized by unusual shifts in mood, energy and activity levels.

躁郁症也称为狂躁抑郁病，被认为影响大约1%至3%的人口，并特点是具有异常变化的情绪，精力和活动水平。