Clinical manifestations of severe placental abruption include abdominal pain, predominantly occult bleeding and shock in severe cases. 1. Abdominal pain: severe placenta previa is often manifested as sudden and persistent abdominal pain, and the degree of abdominal pain is related to the area of placental abruption and the amount of blood behind the placenta, while the area of abruption in severe placenta previa is more than one third. 2. Mainly hidden bleeding: the area of placental abruption is large, or even complete abruption with serious complications, most of the placental abruption surface starts from the center of the placenta, and the bleeding accumulates in the back of the fetal pelvis or the uterine cavity, without vaginal bleeding. 3. Shock phenomenon: due to the pain and the emergence of nausea, vomiting, cold limbs, pale, cold sweat, accelerated heart rate, weak pulse, blood pressure drop and other shock phenomena. Severe placental abruption may also lead to intrauterine asphyxia or even death of the fetus, so the pregnancy should be terminated as soon as possible when severe placental abruption is detected, regardless of the gestational week. If you experience sudden and persistent pain, nausea, vomiting, cold limbs, cold sweat, etc., you should pay special attention and go to the hospital in time to avoid delaying your condition.