The heavy menstrual flow after abortion may be due to the following factors: First, poor recovery of the uterus and contraction after abortion, resulting in lack of uterine contraction when menstruation occurs after the operation, which can not effectively stop the bleeding and lead to heavy menstrual flow. Second, there is infection in the uterine cavity, and the infection factor may lead to heavy menstrual flow with odor. Third, there are residual pregnancy tissues in the uterine cavity after abortion, and the residual pregnancy tissues also bleed during menstruation after the operation, which leads to increased menstrual flow. It is recommended to go to the hospital for ultrasound and other related examinations to clarify the cause of heavy menstrual flow, and use the right medication according to the results.