这类阴道出血的病因明确,已知和妊娠有关,包括妊娠早期阴道出血、妊娠晚期阴道出血、分娩期阴道出血和产褥期阴道出血。妊娠早期阴道出血主要有流产、输卵管妊娠破损后和葡萄胎。不同类型流产的阴道出血特点是:先兆流产于停经后出现少量阴道出血,色鲜红、粉红或深褐色;难免流产于停经后阴道出血超过月经量,可有血块;不全流产于停经后阴道出血可以是大量的,也可以是少量的,并伴有肉样物自阴道排出;稽留流产于停经 The cause of such vaginal bleeding is known and related to pregnancy, including early pregnancy vaginal bleeding, vaginal bleeding in late pregnancy, vaginal bleeding during childbirth and puerperal vaginal bleeding. Vaginal bleeding in early pregnancy mainly abortion, tubal pregnancy and hydatidiform mole. Vaginal bleeding in different types of abortion is characterized by: threatened abortion after a small amount of vaginal bleeding after menopause, bright red, pink or dark brown; inevitable vaginal bleeding after menopause menstrual bleeding, may have blood clots; incomplete abortion vaginal bleeding after menopause can Is a lot, it can be a small amount, accompanied by meat samples from the vaginal discharge; missed abortion in menopause