血友病是先天性凝血因子缺乏的一组伴性遗传性疾病。人群发病率在西方国家为5—10/10万人口,我国的发病率尚无精确统计,血友病甲缺乏血浆因子Ⅷ:C,血友病乙缺乏血浆因子Ⅸ,此二型仅见于男性患者,自幼就有关节、口腔、皮肤出血,患者母和患者的姐妹是 Hemophilia is a group of congenital hereditary diseases that lack congenital coagulation factors. Population incidence in the Western countries for the 5-10 / 10 million population, the incidence of our country no exact statistics, hemophilia A lack of plasma factor Ⅷ: C, hemophilia B lack of plasma factor Ⅸ, the type II only found in men Patients, from childhood, there are joints, mouth, skin bleeding, the patient's mother and the patient's sister is