偏头痛是常见病,美国年发病率男性1％～10％,女性3％～20％。偏头痛的病理生理机制尚不太清楚,推测与血管痉挛和(或)脑血流变化有关,因此随后卒中的危险率也增加,特别是青年缺血性卒中常同时发生偏头痛,但是迄今几乎没有流行病学资料证实。医师健康研究组为一随机、双盲、安慰剂对照研究,1982年开始观察阿司匹林和β-胡萝卜素对心血管疾病和癌症的初级预防作用。全美22071 Migraine is a common disease, the United States annual incidence of 1% to 10% of men and 3% to 20% of women. The pathophysiological mechanism of migraine is not yet clear, presumed to be associated with vasospasm and / or changes in cerebral blood flow, so the subsequent risk of stroke also increased, especially in young people with ischemic stroke often migraine, but so far almost No epidemiological data confirm. The Physicians’ Health Study Group, a randomized, double-blind, placebo-controlled study, began in 1982 to observe the primary prophylaxis of aspirin and beta-carotene on cardiovascular disease and cancer. National 22071