After the drug abortion has residual, will come to menstruation is according to the amount of residual can be judged. First, after the drug abortion, the residual is relatively small, in 1cm or less will not affect the growth of the uterine lining, menstruation will come normally. When menstruation comes, the endometrium will undergo a stripping, which may help to discharge the residual tissue and restore the uterus to its normal shape; two, after medication abortion, the residual tissue is very much more than 1cm, which will cause the endometrium to grow unevenly, and also cause uneven echoes, resulting in abnormal dribbling and constant bleeding; this may affect the arrival of menstruation, and also affect the health of the body. Surgery is the best option to help get rid of this residual tissue as soon as possible. Otherwise, if the tissue grows into the uterine cavity, the problem cannot be solved simply by removing it from the uterus, but requires hospitalization for hysteroscopic electrosurgery to restore the uterus to its normal shape.