If there is sudden and fresh bleeding 15 days after abortion, it is clinically likely that the abortion is not clean and the fresh bleeding is caused by the detachment between the residual tissue in the uterus and the uterine wall. If ultrasound examination reveals residual tissue in the uterine cavity, the uterus should be cleared as soon as possible. It may also be caused by infection, often accompanied by pain in the lower abdomen or smelly vaginal discharge, and anti-inflammatory treatment with oral antibiotics is recommended as soon as possible. Because ovulation will resume about 15 days after miscarriage, the endometrial retreating bleeding caused by the decrease of hormone level in the body during ovulation will lead to vaginal bleeding, and it is recommended to give specific treatment according to the specific problem.