The brain illness known as bipolar disorder produces extreme swings in a person's emotional state, energy level, and capacity for daily tasks. Mood episodes, which can last anywhere from a few days to many weeks, are what people with bipolar disorder refer to when they describe their extreme emotional states. These mood swings might be manic/hypomanic (characterized by extremes of elation or irritability) or depression (sad mood). Many people with bipolar disorder experience moments of normal mood as well. If properly cared for, those who suffer from the bipolar disease can lead fulfilling and fruitful lives.