A lot of menstrual flow after abortion surgery is not normal. The normal human menstrual flow is 20-60mL, if it is clear that the menstrual flow after abortion surgery is more than 80mL, it is excessive menstrual flow, which may be related to the following factors: First, poor uterine rejuvenation and poor uterine contraction after abortion, resulting in the inability to effectively stop bleeding during menstruation, thus leading to excessive menstrual flow. Second, there may be residual pregnancy tissue in the uterine cavity, which flows out together with menstruation, also leading to an increase in menstrual flow. Third, it may be an infection in the uterine cavity, which leads to the menstruation becoming heavy. Fourthly, it may be that the endocrine secretion has not completely returned to normal after the abortion, resulting in a heavy menstrual flow.