The pathogeny is related to many factors such as abnormal blood coagulation function in gestation period,using oxytocin and ergot in labor,heredity,immunity,infection and etc.

• 其病因与妊娠期凝血功能异常、分娩中使用缩宫素及麦角生物碱,并与遗传、免疫及感染等因素有关。