There are two main hazards of medication abortion: First, even in the case of complete abortion, the vaginal bleeding time of medication abortion will be longer, for example, the vaginal bleeding time can be as long as half a month or twenty days. Such a long bleeding time and the premise that the opening of the uterus is open can cause retrograde infection, with bacteria entering the uterine cavity through the cervical opening and then infecting the pelvis, causing inflammation of the pelvis, which can lead to unimaginable consequences. Secondly, the possibility of incomplete abortion may be caused by medical abortion. Incomplete medical abortion requires a second operation to clear the uterus, which may also increase the chance of infection and cause damage to the uterine lining, resulting in cavity adhesions. Therefore, there are two hazards of medical abortion: the first one is infection; the second one is that incomplete medical abortion needs to be cleared.