The placenta is an organ that develops in the uterus during pregnancy. In most pregnancies, the placenta attaches at the top or on the side of the uterus. In placenta previa, the placenta attaches low in the uterus. The placenta might partially or completely cover the opening of the uterus, called the cervix. Placenta previa can cause severe bleeding in the mother before, during or after delivery.
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