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<link rel="alternative" hreflang="en" href="https://medlineplus.gov/ency/article/000900.htm"/><meta property="og:title" content="Placenta previa: MedlinePlus Medical Encyclopedia"/><meta property="og:url" content="https://medlineplus.gov/ency/article/000900.htm"/><meta property="twitter:title" content="Placenta previa: MedlinePlus Medical Encyclopedia"/><meta name="twitter:card" content="summary_large_image"/><meta name="description" content="Placenta previa is a problem of pregnancy in which the placenta grows in the lowest part of the womb (uterus) and covers all or part of the opening to the cervix."/><meta itemprop="description" name="description" content="Placenta previa is a problem of pregnancy in which the placenta grows in the lowest part of the womb (uterus) and covers all or part of the opening to the cervix."/><meta property="og:description" content="Placenta previa is a problem of pregnancy in which the placenta grows in the lowest part of the womb (uterus) and covers all or part of the opening to the cervix."/><meta property="twitter:description" content="Placenta previa is a problem of pregnancy in which the placenta grows in the lowest part of the womb (uterus) and covers all or part of the opening to the cervix."/><meta property="og:image" content="https://medlineplus.gov/images/share_ency_1.jpg"/><meta property="og:image" content="https://medlineplus.gov/images/share_ency_2.jpg"/><meta property="og:image" content="https://medlineplus.gov/images/share_ency_3.jpg"/><meta property="twitter:image" content="https://medlineplus.gov/images/share_ency_1.jpg"/>
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</a><h1 class="with-also" itemprop="name">Placenta previa</h1>
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</noscript></div><div class="main"><div id="ency_summary"><p>Placenta previa is a problem of pregnancy in which the placenta grows in the lowest part of the womb (uterus) and covers all or part of the opening to the <a test="test" href="./002317.htm">cervix</a>.</p><p>The placenta grows during pregnancy and feeds the developing baby. The cervix is the opening to the birth canal.</p></div><section><div class="section"><div class="section-header"><div class="section-title"><h2>Causes</h2></div><div class="section-button"><button type="submit" aria-controls="section-1" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-1"><p>During pregnancy, the placenta moves as the womb stretches and grows. It is very common for the placenta to be low in the womb in early pregnancy. But as the pregnancy continues, the placenta moves to the top of the womb. By the third trimester, the placenta should be near the top of the womb, so the cervix is open for delivery.</p><p>Sometimes, the placenta partly or completely covers the cervix. This is called a placenta previa.</p><p>There are different forms of placenta previa:</p><ul><li>Marginal: The placenta is next to the cervix but does not cover the opening.</li><li>Partial: The placenta covers part of the cervical opening.</li><li>Complete: The placenta covers all of the cervical opening. </li></ul><p>Placenta previa occurs in 1 out of 200 pregnancies. It is more common in women who have:</p><ul><li>An abnormally shaped uterus</li><li>Had many pregnancies in the past</li><li>Had multiple pregnancies, such as twins or triplets</li><li>Scarring on the lining of the uterus due to a history of surgery, C-section, or abortion</li><li>In vitro fertilization </li><li>A history of placenta previa in a previous pregnancy</li></ul><p>Women who smoke, use cocaine, or have their children at an older age may also have an increased risk.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Symptoms</h2></div><div class="section-button"><button type="submit" aria-controls="section-2" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-2"><p>The main symptom of placenta previa is <a test="test" href="./003264.htm">sudden bleeding from the vagina</a>. Some women also have cramps. The bleeding often starts near the end of the second trimester or beginning of the third trimester.</p><p>Bleeding may be severe and life threatening. It may stop on its own but can start again days or weeks later.</p><p>Labor sometimes starts within several days of the heavy bleeding. Sometimes, bleeding may not occur until after labor starts.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Exams and Tests</h2></div><div class="section-button"><button type="submit" aria-controls="section-3" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-3"><p>Your health care provider can diagnose this condition with a pregnancy ultrasound.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Treatment</h2></div><div class="section-button"><button type="submit" aria-controls="section-4" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-4"><p>Your provider will carefully consider the risk of bleeding against early delivery of your baby. After 36 weeks, delivery of the baby may be the best treatment.</p><p>Nearly all women with placenta previa will need a <a test="test" href="./002911.htm">C-section</a>. If the placenta covers all or part of the cervix, a vaginal delivery can cause severe bleeding. This can be deadly to both the mother and baby.</p><p>If the placenta is near or covering part of the cervix, your provider may recommend:</p><ul><li>Reducing your activities</li><li>Bed rest</li><li>Pelvic rest, which means no sex, no tampons, and no douching </li></ul><p>Nothing should be placed in your vagina.</p><p>You may need to stay in the hospital so your health care team can closely monitor you and your baby.</p><p>Other treatments you may receive:</p><ul><li>Blood transfusions</li><li>Medicines to prevent early labor</li><li>Medicines to help pregnancy continue to at least 36 weeks</li><li>Shot of special medicine called Rhogam if your blood type is Rh-negative</li><li>Steroid shots to help the baby's lungs mature </li></ul><p>An emergency C-section may be done if the bleeding is heavy and cannot be controlled.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Outlook (Prognosis)</h2></div><div class="section-button"><button type="submit" aria-controls="section-5" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-5"><p>The biggest risk is severe bleeding that can be life threatening to the mother and baby. If you have severe bleeding, your baby may need to be delivered early, before major organs, such as the lungs, have developed.</p><p>For most women who receive regular prenatal care, this condition is diagnosed before symptoms appear. This helps the provider and mother take steps to minimize risks from this condition.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>When to Contact a Medical Professional</h2></div><div class="section-button"><button type="submit" aria-controls="section-6" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-6"><p>Contact your provider if you have vaginal bleeding during pregnancy. Placenta previa can be dangerous to both you and your baby.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Alternative Names</h2></div><div class="section-button"><button type="submit" aria-controls="section-Alt" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-Alt"><p>Vaginal bleeding - placenta previa; Pregnancy - placenta previa</p></div></div></section><section><div class="section sec-mb"><div class="section-header"><div class="section-title"><h2>Images</h2></div><div class="section-button"><button type="submit" aria-controls="section-tnails" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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<li><img src="//medlineplus.gov/ency/images/ency/tnails/17010t.jpg" alt="Anatomy of a normal placenta" title="Anatomy of a normal placenta" class="side-img"/><a href="../imagepages/17010.htm">Anatomy of a normal placenta</a></li>
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<li><img src="//medlineplus.gov/ency/images/ency/tnails/17122t.jpg" alt="Placenta previa" title="Placenta previa" class="side-img"/><a href="../imagepages/17122.htm">Placenta previa</a></li>
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<li><img src="//medlineplus.gov/ency/images/ency/tnails/2261t.jpg" alt="Ultrasound, normal fetus - arms and legs" title="Ultrasound, normal fetus - arms and legs" class="side-img"/><a href="../imagepages/2261.htm">Ultrasound, normal fetus - arms and legs</a></li>
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<li><img src="//medlineplus.gov/ency/images/ency/tnails/9980t.jpg" alt="Placenta" title="Placenta" class="side-img"/><a href="../imagepages/9980.htm">Placenta</a></li>
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</ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>References</h2></div><div class="section-button"><button type="submit" aria-controls="section-Ref" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-Ref"><p>Francois KE, Foley MR. Antepartum and postpartum hemorrhage. In: Landon MB, Galan HL, Jauniaux ERM, et al, eds. <em>Gabbe's Obstetrics: Normal and Problem Pregnancies</em>. 7th ed. Philadelphia, PA: Elsevier; 2021:chap 18.</p><p>Hull AD, Resnik R, Silver RM. Placenta previa and accreta, vasa previa, subchorionic hemorrhage, and abruptio placentae. In: Lockwood CJ, Copel JA, Dugoff L, et al, eds. <em>Creasy and Resnik's Maternal-Fetal Medicine: Principles and Practice</em>. 9th ed. Philadelphia, PA: Elsevier; 2023:chap 43.</p><p>Henn MC, Lall MD. Complications of pregnancy. In: Walls RM, ed. <em>Rosen's Emergency Medicine: Concepts and Clinical Practice</em>. 10th ed. Philadelphia, PA: Elsevier; 2023:chap 173.</p></div></div></section>
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<div id="section-version" class="section-body"><p>Updated by: John D. Jacobson, MD, Professor Emeritus, Department of Obstetrics and Gynecology, Loma Linda University School of Medicine, Loma Linda, CA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team. </p>
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