After spontaneous abortion, menstruation usually comes after 1 month. Spontaneous abortion is the pregnancy can be naturally discharged through the cervix, if the patient has the situation of incomplete discharge of the uterine cavity, after the medication to promote the discharge of the treatment can not be discharged in a timely manner, need to give timely treatment of purging, in order to prevent the impact on the uterine contraction, resulting in the uterine cavity bleeding for a long time, uterine cavity infections and other situations. Women in the endometrial thinning after spontaneous abortion, through the ovarian secretion of estrogen and progesterone, in the first half of the menstrual cycle by the influence of estrogen to make the endometrial growth, in the second half of the menstrual period of estrogen and progesterone together to make the endometrium continue to grow to 1.2cm or so will occur in the endometrial stripping so that menstruation. At the same time, after a spontaneous abortion, the patient may experience psychological stress and emotional changes, which may cause the time of menstruation to fluctuate slightly. In addition, after abortion, patients need to pay attention to preventing infections and increasing nutrition, which is conducive to the recovery of the body and can also help the menstruation to come normally.