Under normal circumstances, the growth of the placenta after a woman’s pregnancy does not cause bleeding. If the bleeding is caused by the growth of the placenta, it is most common in the following cases: 1. Bleeding due to low position of the placenta, which is called the anterior state of the placenta before the 28th week of pregnancy and the placenta praevia after the 28th week of pregnancy. Patients present with recurrent painless vaginal bleeding, which can be a small amount of spotting or heavy bleeding, and may cause miscarriage in severe cases. Repeated abortion, curettage, cesarean section and infection with pelvic inflammatory disease may cause low placenta position.2. Placenta implantation, when a woman’s placenta implants into the myometrium or even penetrates the myometrium to reach the pelvis, recurrent bleeding is likely to occur. The situation of placenta implantation is very dangerous. If the implantation is shallow, the pregnancy can be continued under close observation; if the implantation is deep, surgery must be done for timely treatment.