What causes placenta accreta?

Normally, the placenta attaches to the inner lining of the uterus and separates after birth. With placenta accreta, the boundary between the lining and the uterine muscle is altered, allowing placental tissue to grow more firmly into the wall. A previous Caesarean Section is a recognised contributor because it can leave a uterine scar. Risk can also relate to placenta previa or other procedures and conditions that affect the uterine lining. Some people develop placenta accreta without an obvious risk factor.

If scans suggest placenta accreta, care is usually coordinated by an obstetric team with experience in high-risk pregnancy and birth. Ultrasound is commonly used to assess placental position and features; further imaging may be considered. The team plans the timing and place of birth, blood availability and support for possible bleeding. Keep scheduled appointments and tell the maternity team promptly about bleeding, pain or contractions.

Contact your maternity unit urgently for any vaginal bleeding, severe abdominal pain, regular contractions, dizziness, faintness or reduced fetal movement. Do not wait for a routine appointment when bleeding is heavy or you feel unwell. Emergency assessment is needed if symptoms suggest significant blood loss or labour.

Where is my placenta and what did the scan show? How will my birth plan account for possible bleeding? Which hospital team will care for me, and what symptoms require immediate attendance?