双相障碍是以起伏性躁狂或抑郁为特征的慢性周期性精神疾病。
Bipolar disorder is a chronic and recurrent psychiatric disorder, which is characterized by waving mania or depression.
阶段性的躁狂和抑郁通常在一生中反复发作。
Episodes of mania and depression typically recur across the life span.
他们发现阈下性轻躁狂者比无躁狂行为的抑郁者有更高的焦虑率和药物滥用率，抑郁的发作次数也更高。
They found that people with subthreshold hypomania have higher rates of anxiety and substance abuse and more depressive episodes than depressed people who don't exhibit manic behavior.
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