n (重性抑郁症) major depression is bination (组合) of all symptoms that disturb the person's daily routine works, study, sleep, eating and enjoying habits. This depression appears only once but mostly occurs several times in a lifetime. It is less severe type of depression.From this depression, people don't disable because it does not involve all symptoms.This type of depression keeps people from functioning well or from felling good.Many people who are in dysthymia depression feel like major depression afger some time. Dysthymia Depression (心境抑郁) Bipolar disorder (躁郁症) It is also called as manic-depressive illness (狂躁抑郁症病) .Bipolar disorder is characterized ( 特征) by cycling (循环) mood change dramatically (戏剧性的) and rapidly.The people in bipolar disorder feel like elated (兴高采烈的) .