People with dysthymia may also experience one or more episodes of major depression during their lifetimes .

心境恶劣患者在其一生中，也会经历一次或更多此的重度抑郁。

At one end is severe depression , above which is moderate depression and then mild low mood , which many people call " the blues " when it is short-lived but is termed " dysthymia " when it is chronic .

一端是严重的抑郁，其上是中度抑郁，其次是温和的低落情绪，当短暂发生时，人们称之“忧郁”；当它是慢性时，我们定义为“恶劣心境”。

Bipolar disorder , also called manic-depressive illness , is not as common as major depression or dysthymia .

双相情感障碍，也叫做躁郁症，并不像重度抑郁症或心境恶劣一样普遍。

Pessimistic personality.people who have low self-esteem and a negative outlook are at higher risk of becoming depressed . These traits may actually be caused by low-level depression ( called dysthymia ) .

悲观的性格.那些自尊心较低持着消极态度的人更容易抑郁.这些特征也可能实际由轻度的抑郁症造成（精神抑郁）.