Most of the patients after abortion surgery, usually in the postoperative month will come to menstruation, there may be a few days in advance or delayed, but if the menstruation is delayed for a longer period of time, it is still necessary to consider the following situations: First, may be pregnant again, some patients after abortion resumption of sexual life, but did not do contraception, this situation is very easy to cause another pregnancy. Second, endocrine disorders, due to surgical stimulation led to ovarian dysfunction, thus causing irregular menstruation. Third, the occurrence of uterine adhesion or cervical adhesion, abortion surgery will lead to the damage and lack of endothelium, if the endothelium is not recovered well, it is easy to lead to the occurrence of adhesion.