The lower abdominal pain that occurs after a medical abortion is a normal mechanism. In the process of medical abortion, the initial application of mifepristone followed by misoprostol is required. After the application of misoprostol for about 2-3 hours, a small amount of vaginal bleeding will occur and lower abdominal pain will gradually appear. The contraction of the uterus will further strengthen the contraction, reduce the vaginal bleeding and further exclude the residual tissues in the uterine cavity to minimize the bleeding, so the lower abdominal pain after medical abortion is a normal situation.