Some young couples often have to use abortion to terminate pregnancy due to contraceptive failure, what is the bad effect of this on future pregnancies? Each abortion and scraping will cause trauma to the endometrium, causing an immune response to the endometrium. If pathogenic microorganisms are infected during and after the operation, endometritis will occur, and if the infection is not treated promptly and effectively, it will spread through the fallopian tubes to the pelvis and even to the entire abdominal cavity, leading to pelvic inflammatory disease or peritonitis, and some women will no longer be able to get pregnant. This is because the endometrium is not healthy enough and the placenta does not grow well and cannot get enough nutrients. In order to get enough nutrients, some placentas grow thin and large and occupy a large area, so placenta praevia can easily occur and cause vaginal bleeding during pregnancy. Even if the pregnancy can be maintained to full term, during delivery, the placenta often adheres to the uterine wall and even implants into the uterine wall, causing severe postpartum bleeding. The above examples show that abortion should not be done casually more often, let alone as a means of contraception, because the dangers of multiple abortion procedures themselves, such as surgically induced uterine perforation, infection, and bleeding, can increase significantly. So good contraception is needed before planning to have a child, and it should not be replaced by abortion. Therefore, young couples who are not planning to have children must have good contraception to avoid causing unwanted pregnancies and then opting for abortions that can cause damage to the uterus.