Placenta previa can be dangerous and can easily cause placental abruption and hemorrhage. Placenta previa means that the placenta does not appear in the body of the uterus, but in the cervical opening. Under normal circumstances, the placenta is usually located in the body of the uterus, the posterior wall of the uterus, the anterior wall of the uterus and the lateral wall, but if the placenta is located in the cervical opening, it may be in the form of complete or borderline placenta previa. Placenta previa can easily lead to hemorrhage, placental abruption, etc., according to the actual situation to give targeted prevention and treatment, and pay attention to pregnancy detection, regular ultrasound examination of the fetus and other ultrasound examinations, and do a good job in monitoring various indicators of the fetus, to avoid miscarriage, preterm delivery and other adverse situations, and pay attention to avoid sexual intercourse during pregnancy. If obvious abdominal pain, vaginal bleeding and other discomforts occur during pregnancy, you should immediately go to the hospital for examination and treatment under the guidance of the doctor, do not blindly use drugs.