migraine 偏 头 痛Chongqing University of Medical Science Migraine is manifested by headache that isa recurrence, usually unilateral and frequently pulsatile in quality 搏动性; it is often associated with nausea, vomiting, photophobia畏光, phonophobia惧声 and lassitude乏力. Visual or other neurologic auras神经学先兆 occur in about10% of patients. The onset is early in life approximately 25%beginning during the first decade, 55% by 20 years of age, more than 90% before age 40. A.Cause and pathogenesis The real ca