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Causes
By Mayo Clinic staffEarly in pregnancy, the placenta may implant in the lower part of the uterus. As the uterus grows, the placenta usually moves up and away from the opening of the uterus (cervix). If it doesn't, the cervix may be blocked. This is placenta previa.
Placenta previa is associated with:
- Scars in the lining of the uterus (endometrium)
- A large placenta, such as with a multiple pregnancy
- An abnormally shaped uterus
- Lockwood CJ, et al. Clinical manifestations and diagnosis of placenta previa. http://www.uptodate.com/hom. Accessed April 17, 2009.
- Sakornbut E, et al. Late pregnancy bleeding. American Family Physician. 2007;75:1199.
- Zeltzer JS. Vaginal bleeding in late pregnancy. In: Rakel RE, et al. Conn's Current Therapy 2008. 60th ed. Philadelphia, Pa.: Saunders Elsevier; 2008. http://www.mdconsult.com/das/book/body/132444171-3/831220627/1621/508.html#4-u1.0-B978-1-4160-4435-2..50256-9_4080. Accessed April 17, 2009.
- Lockwood CJ, et al. Management of placenta previa. http://www.uptodate.com/hom. Accessed April 17, 2009.
