Placenta previa

The normal placenta attaches to the posterior, anterior, or lateral walls of the uterine body. If the placenta is attached to the lower part of the uterus, or even the lower edge of the placenta reaches or covers the inner mouth of the cervix, its position is lower than the exposed part of the fetus, which is called placenta previa. Placenta previa is one of the main causes of bleeding in late pregnancy. It is a serious complication of pregnancy. Improper management can endanger the life of mothers and children. Its incidence is reported in China from 0.24% to 1.57%, and reported abroad at 1.0%. 85% to 90% of patients with placenta previa are menopausal, especially those with multiple births, and the incidence can be as high as 5%.