The symptoms of placental abruption are clots and pressure marks on the maternal surface of the placenta. Sometimes, the symptoms and signs of placental abruption are not obvious, and the placental abruption is only detected when there are clots and pressure marks on the maternal surface of the placenta during the postpartum examination of the placenta. After 20 weeks of gestation or during labor, the normal position of the placenta is partially or completely detached from the uterine wall before delivery of the fetus, which is called placental abruption. The main symptom of mild placental abruption is vaginal bleeding, which is usually heavy and dark red in color, and may be accompanied by mild abdominal pain or insignificant abdominal pain, with no significant signs of anemia. The main symptom of severe placental abruption is sudden and persistent abdominal pain and/or back pain, the degree of which varies according to the size of the abruptive surface and the amount of blood accumulated behind the placenta, the more blood accumulated the more intense the pain. Prevention of clots and pressure marks on the maternal surface of the placenta: 1. Prevention of gestational hypertensive syndrome Gestational hypertensive syndrome is likely to occur in the middle and late stages of pregnancy. Once a pregnant woman develops symptoms of hypertension, edema and proteinuria, she should actively go to the hospital for early treatment. 2, sudden abdominal pain in late pregnancy should be beware In the course of pregnancy, especially in late pregnancy, sudden abdominal pain and vaginal bleeding should immediately go to the hospital. Once the placenta abruptio is confirmed, the pregnancy should be terminated quickly and the delivery should be ended within 6 hours of the placenta abruptio. 3, pay attention to safety during pregnancy, especially in late pregnancy Be careful when walking during pregnancy, especially when going up and down the stairs. Do not go to crowded occasions, avoid taking the bus, and do not drive to avoid falling or making the abdomen hit and squeezed. 4. Do prenatal checkups on time Prenatal checkups can detect abnormalities early. If there is placental abruption, it can be detected early through ultrasonic examination and delivery monitoring device, and corresponding countermeasures can be taken as soon as possible.