Miscarriage is mainly divided into spontaneous abortion and artificial abortion. Spontaneous abortion includes pre-eclampsia, indolent abortion, biochemical pregnancy, incomplete abortion, inevitable abortion and so on. Artificial abortion mainly includes medication abortion and induced abortion. In most cases, women do not want to get pregnant and will choose artificial abortion. The success rate of medical abortion is relatively low, only 60%-70%, and the abortion needs to be cleaned up if it is not successful. So relatively speaking, most women will choose to have an abortion. The success rate of abortion can be as high as about 95%, and nowadays the choice of painless abortion helps women to overcome the pain during the abortion.