Placental abruption occurs when the placenta partly or completely separates from the inner wall of the uterus before delivery. This can decrease or block the baby's supply of oxygen and nutrients and cause heavy bleeding in the mother. Symptoms: - Vaginal bleeding, although there might not be any - Abdominal pain - Back pain - Uterine tenderness or rigidity - Uterine contractions, often coming one right after another The cause of placental abruption is often unknown. Possible causes include trauma or injury to the abdomen. Patients with previous history of PA, hypertension, trauma, infection and smoking are at higher risk of PA. It might cause mother to go into shock because of excessive bleeding and may cause clotting problems. In the fetus PA may cause restricted growth, premature birth or still birth It is diagnosed theough a physical exam checking for uterine tenderness and rigidity. Ultra sound and some blood tests are also performed. Before 34 weeks if the baby is doing well, patient might be admitted for close monitoring. In babies close to term and compromised condition an urgent C-section is required.