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The most common symptom of placenta previa is vaginal bleeding that is bright red and not associated with abdominal tenderness or pain, especially in the third trimester of pregnancy. However, each woman may exhibit different symptoms of the condition or symptoms may resemble other conditions or medical problems.
Placental Abruption. Placental abruption, also called abruptio placentae (image), is the early separation of the placenta (the baby's life support system) from the uterine wall. This can occur any time after week 20 of pregnancy but is more common in the third trimester.