偏头痛，即严格意义上的单侧头痛，脑自主神经症状的出现会造成与丛集性头痛诊断的混乱。

For migraine with strictly unilateral headache, the presence of CAS might cause diagnostic confusion with ch.

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偏头痛是一种周期发作的血管性头痛，多半是单侧性的，也可能是双侧性的。

Migraine is a type of Vascular Headache with a cyclical nature. Most of the time, the pain is one sided, but it is also possible to experience pain on both sides of the head.

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