Uterine residues of more than 1 cm require removal of the uterus. Incomplete abortion can occur after an abortion or a medication abortion. If there is residue in the uterine cavity on ultrasound more than two weeks after miscarriage, at this time, if there is bleeding, regardless of the size of the residue, the uterus must be removed to avoid infection and intrauterine hemorrhage. If the residue is within 1cm and there is no vaginal bleeding, it can be temporarily observed and oral anti-inflammatory drugs can be taken to avoid infection. If the residue is more than 1 cm or there is vaginal bleeding, the uterus must be removed as soon as possible. The presence of residue in the uterine cavity can easily cause bacterial infection and in severe cases can cause uterine adhesions, which may have serious effects on the next pregnancy and menstruation.