If there is residue in the uterus, most of them are caused by incomplete abortion. If there is residue in the uterine cavity after abortion or medication abortion, more than 10 days after ultrasound, if it is more than 1cm, the uterus must be cleared, regardless of whether there is vaginal bleeding or not. If it is less than 1cm, but there is vaginal bleeding, it should be cleared. If it is within 1cm and there is no vaginal bleeding, it can be observed with medication, applying medication to promote uterine contraction and blood circulation, and also oral mifepristone, or Estradiol, for more than seven days. If there are still residues in the uterine cavity when the ultrasound is done after the menstruation, the uterus must be cleared, if there are no residues in the uterine cavity when the ultrasound is done, it means it is cured.