If the placenta is located in the lower edge of the posterior wall of the uterus up to the endocervix, it may be a placenta hypoplasia or placenta praevia, usually related to the gestational week, the common causes and treatment methods are as follows: 1. Placenta hypoplasia: If before 28 weeks of gestation, the placenta is found to be attached to the lower segment of the uterus by ultrasonography, and the lower edge reaches or covers the endocervix, at this time the position of the placenta is not yet fixed, so it is called placenta hypoplasia; by the In late pregnancy, the formation of the lower segment of the uterus affects the relationship between the endocervix and the edge of the placenta, which in turn causes the placenta originally attached to the lower segment of the uterus to move up with the uterine body and change to the normal position of the placenta. If there is a lot of bleeding, repeated bleeding or when labor is already in progress, termination of pregnancy should be considered according to the specific situation; 2. Placenta praevia: If the placenta is still attached to the lower segment of the uterus after 28 weeks of gestation and the lower edge reaches or covers the endocervical opening, it is called placenta praevia. Placenta praevia can cause repeated vaginal bleeding in pregnant women, but often not accompanied by abdominal pain. In serious cases, it can lead to anemia, postpartum hemorrhage, placental implantation, puerperal infection and other adverse consequences, and even cause fetal hypoxia, resulting in poor pregnancy outcome. When a pregnant woman has placenta praevia, she should pay attention to absolute bed rest, prohibit sexual intercourse, take appropriate iron supplements according to the severity of anemia, and transfuse blood if necessary. Closely monitor the vital signs and vaginal bleeding of the pregnant woman, expect treatment generally until 37 weeks, if the indicators suggest that the fetus has matured, the pregnancy should be terminated at an appropriate time. Precautions When the pregnant woman has a low placental state and placenta praevia, avoid strenuous exercise, such as running and jumping. You should strengthen the monitoring of fetal movement, regular obstetric examination, and prohibit sexual intercourse and strenuous exercise. Once symptoms such as vaginal bleeding and abdominal pain occur, you should go to the hospital in time to get a clear diagnosis and then treat the symptoms.