In pregnancy, the normal position of the placenta should be in the anterior, posterior or lateral wall of the uterine body. If the position of the placenta is abnormal, such as the placenta is located in the lower part of the uterus and the edge of the placenta is close to the inner cervical opening, it is a low lying placenta, and a low lying placenta can easily lead to the problem of spontaneous abortion or premature birth. The causes of abnormal placental position are: endometrial damage, women with multiple abortions or curettage treatment are prone to endometritis or atrophic endometrial lesions. The placenta is displaced near the cervix due to malnutrition of the endometrium during pregnancy, which is not conducive to placental implantation. Excessive placental area, which extends the placenta into the lower segment of the uterus. The causes of abnormal placental position should be analyzed according to your specific situation, and you need to go to the hospital for regular pregnancy checkups after pregnancy.