A class of disabling primary headache disorders, characterized by recurrent unilateral pulsatile headaches. The two major subtypes are common migraine (without aura) and classic migraine (with aura or neurological symptoms). (International Classification of Headache Disorders, 2nd ed. Cephalalgia 2004: suppl 1)

偏头痛是一种出现反复轻度或重度头痛的慢性疾病，通常伴有各种自主神经系统症状。

偏头痛是临床最常见的原发性头痛类型，临床以发作性中重度、搏动样头痛为主要表现，头痛多为偏侧，一般持续4～72小时，可伴有恶心、呕吐，光、声刺激或日常活动均可加重头痛，安静环境、休息可缓解头痛。偏头痛是一种常见的慢性神经血管性疾患，多起病于儿童和青春期，中青年期达发病高峰，女性多见，男女患者比例约为1∶2～3，人群中患病率为5%～10%，常有遗传背景。

偏头风，又称偏头痛，其痛暴发，痛势甚剧，或左或右，或连及眼、齿，痛止则如常人，多系肝经风火所致。

A migraine is a primary headache disorder characterized by recurrent headaches that are moderate to severe. Typically, episodes affect one side of the head, are pulsating in nature, and last from a few hours to three days. Associated symptoms may include nausea, vomiting, and sensitivity to light, sound, or smell. The pain is generally made worse by physical activity, although regular exercise may have prophylactic effects. Up to one-third of people affected have aura: typically a short period of visual disturbance that signals that the headache will soon occur. Occasionally, aura can occur with little or no headache following, but not everyone has this symptom.