The classic form of the illness, which involves recurrent episodes of mania and depression, is called bipolar I disorder.
这种疾病的典型形式包含周期性的躁狂和抑郁，称为双相I型。
Some individuals, such as those with chronic or recurrent depression, may need to stay on the medication indefinitely.
一些慢性抑郁或复发性抑郁的患者可能需要长期服药。
Said Danese. These biological differences might explain some of the observed increase in recurrent depression, he said, but that link would have to be established in further research.
这些生理差别可能会解释一些可看到的复发性忧郁症上升的现象，他说，但这种联系需要在进一步研究中证实。
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