DefinitionBy Mayo Clinic staff
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Placenta previa (pluh-SEN-tuh PREH-vee-uh) occurs when a baby's placenta partially or totally covers the mother's cervix — the doorway between the uterus and the vagina. Placenta previa can cause severe bleeding before or during delivery.
The placenta provides oxygen and nutrients to your growing baby and removes waste products from your baby's blood. It attaches to the wall of your uterus, and your baby's umbilical cord arises from it. In most pregnancies, the placenta attaches at the top or side of the uterus. In placenta previa, the placenta attaches to the lower area of the uterus.
If you have placenta previa, you'll probably be restricted to bed rest for a portion of your pregnancy and you'll likely require a caesarean section (C-section) to safely deliver your baby.
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