Some people, however, never develop severe mania but instead experience milder episodes of hypomania that alternate with depression; this form of the illness is called bipolar II disorder.

但是，一些人从未发展成严重的躁狂，而是处在较温和的轻躁期。这种形式，我们称为双相ii型。

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According to the NIMH-funded Course and Outcome of bipolar Youth study, 25% of children with bipolar disorder not otherwise specified (NOS) convert to bipolar I or II disorder within about 18 months.

据NIMH资助的双相青春期研究结果，25%的儿童双相患者在18个月内，成为了双相I型或II型(未有特殊说明NOS)。

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What is bipolar II disorder?

CNN: STORY HIGHLIGHTS

Bipolar II is a less severe form of the disorder than bipolar I, according to the clinic.

WSJ: Jesse Jackson Jr. Has Bipolar Disorder, Mayo Clinic Says