Medication abortion is the administration of mifepristone and misoprostol, which is a form of abortion to terminate early intrauterine pregnancy up to 49 days of pregnancy. The painful symptoms during medication abortion are caused by uterine contractions. After taking mifepristone, the anti-progesterone effect of mifepristone will affect the normal function of progesterone, which will change the traits of the uterine lining, which is not conducive to the continued development of the fertilized egg, and misoprostol will induce uterine contractions, which will work together to result in the expulsion of the gestation sac from the body. The pain caused by uterine contractions during a medication abortion is like that of normal labor, but it is less severe and lasts for a shorter period of time. The more severe pain symptoms last no more than half an hour and most women can tolerate the pain.