There are two main possibilities for brown vaginal discharge after the operation: First, normal postoperative vaginal bleeding, after the operation to clear the uterine cavity trauma, blood vessel exposure and bleeding, while the trauma in the process of repair will also appear to ooze blood, but the blood will also stimulate the patient’s uterine wall, the uterus contraction, so it can play a role in stopping the bleeding, and women’s blood platelets and other blood clotting factors are also present. So the patient after surgery, vaginal bleeding in the first 2-3 days, the amount of slightly more, bright red color, 3 days after the blood will decrease, into brown discharge, under normal circumstances, brown discharge within 7-10 days can be clean, do not need to carry out special intervention and treatment. Secondly, if the purging surgery is not done thoroughly, there is residue in the uterine cavity or postoperative uterine infection, poor uterine recuperation leading to vaginal bleeding, the patient will bleed for a longer period of time, most of the time, there is a small drop in the abdomen, hidden pain and discomfort, through ultrasound or gynecological internal examination, blood routine and other related tests can be clearly diagnosed.