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Related & look-alikes

Placental & bleeding Medical emergency

Placental abruption

Also known as Abruptio placentae, Placental separation. Usually the third trimester.

Sudden belly pain with vaginal bleeding in the second half of pregnancy can signal a placental abruption: the placenta peeling off the uterine wall before birth. Because the placenta is your baby's supply line for oxygen and nutrients, a separation cuts off part of that supply and bleeds heavily, which makes it an emergency. The bleeding is sometimes hidden, so severe, constant pain can be the main clue. Do not wait for these signs to pass: call 911 or go in now.

Know the warning signs When to call a provider
How common
About 1% of pregnancies
Roughly 1 in 100, most often in the third trimester.
When
Third trimester
Can occur any time in the second half of pregnancy.
Urgency
Emergency
Sudden belly pain with bleeding needs 911 or labor and delivery now.
Outlook
Depends on severity
Mild cases often do well; severe ones need urgent delivery.

This can be a medical emergency. Sudden or severe, constant belly or back pain If this happens, go to the ER or call 911 right away.

Understanding it

What is placental abruption?

The placenta is meant to stay locked to the uterine wall until after your baby is born. In an abruption it separates early, partly or completely, tearing the vessels between placenta and uterus. The detached area can no longer feed your baby, and the torn vessels bleed. That double hit, a bleed for you and a failing supply line for your baby, makes abruption a true emergency.

It affects roughly 1% of pregnancies, most often in the third trimester. The classic picture is sudden belly or back pain with vaginal bleeding, and a uterus that feels hard, tender, and contracts in waves one on top of another. That painful pattern is the opposite of placenta previa, whose bleeding is usually painless.

One feature is easy to miss: the bleeding is not always visible. Blood can stay trapped between the placenta and the uterine wall, so a serious abruption may show little or no vaginal bleeding. That is why severe, constant belly pain, even with scant bleeding, is a red flag.

Abruption is largely a clinical diagnosis, read from your symptoms and from monitoring you and your baby, because ultrasound often looks normal even as one unfolds. Treatment tracks severity and gestational age: a small, stable, preterm abruption may be watched, while a severe one calls for urgent delivery, usually by cesarean, with transfusion if needed.

Symptoms

What are the symptoms?

The typical picture is sudden painful bleeding with a firm, tender uterus. Because bleeding can hide, severe belly pain is a warning sign whether or not you see blood, and these signs mean going in now.

Early signs

  • Vaginal bleeding, which may be dark
  • Belly or back pain
  • Uterine tenderness
  • Contractions coming one right after another
  • In slower (chronic) cases, intermittent dark spotting

Emergency signs — call 911

  • Sudden or severe, constant belly or back pain
  • A hard, rigid, tender uterus that will not relax
  • Heavy vaginal bleeding
  • Severe belly pain even without much visible bleeding, because bleeding can be concealed
  • Your baby moving less than usual
  • Feeling faint, dizzy, pale, or having a racing heart

Why it matters

Risks to you and baby

Heavy bleeding and shock

A large abruption can cause rapid, dangerous blood loss and shock, sometimes needing a transfusion. This is the main threat to you and why abruption is treated urgently.

Blood clotting problems

A severe abruption can trigger disseminated intravascular coagulation (DIC), where the blood loses its ability to clot, worsening the bleeding. It is managed with blood products in the hospital.

Reduced oxygen to your baby

The separated area can no longer supply your baby, which can cause fetal distress and, in severe cases, stillbirth. Continuous monitoring watches for it, and it is a major reason to deliver urgently.

Preterm birth

Many abruptions lead to early delivery, either forced by the abruption or chosen as the safest course. Steroids are given when time allows to help your baby's lungs.

Organ injury

Major blood loss can injure the kidneys and other organs. Prompt treatment and transfusion aim to prevent it.

How it's found

How is it diagnosed?

Abruption is mainly a clinical diagnosis, based on your symptoms and on monitoring you and your baby. Ultrasound can help but is often normal, so a clear scan does not rule it out.

Clinical assessment

Your pattern of pain and bleeding, and how firm and tender your uterus feels, are central to spotting an abruption.

Continuous fetal monitoring

Tracks your baby's heart rate for distress and records contraction frequency and strength, both key to the delivery decision.

Ultrasound

May show a clot behind the placenta but often looks normal. Its main role is to rule out placenta previa as the bleeding source.

Blood tests

A blood count and clotting studies gauge blood loss and watch for DIC. In Rh-negative patients, a test may guide the dose of Rho(D) immunoglobulin.

Urgently, whenever bleeding or significant belly pain strikes in the second half of pregnancy. Evaluation and monitoring start at once, not after test results.

Treatment

How is it managed?

Abruption is a medical emergency, and management follows its severity, your gestational age, and how you and your baby are doing. The two poles are close observation for a mild, stable, preterm case and urgent delivery for a severe one.

Treatment paths

Monitoring is continuous from the moment abruption is suspected. If it is mild, you are both stable, and it is too early to deliver, you may be watched in the hospital with steroids for your baby's lungs. If bleeding turns heavy, you become unstable, or your baby shows distress, delivery is prompt, usually by cesarean. Transfusion and clotting support are given as needed.

Medication

Steroids for fetal lung maturity if preterm delivery is likely, and Rho(D) immunoglobulin for Rh-negative patients. Blood products treat significant blood loss or clotting problems.

Monitoring

Continuous fetal heart-rate monitoring, frequent vital-sign checks, and repeat blood tests track you both and guide delivery timing.

Can it recur?

Yes. After one abruption, the risk of another runs higher than average, roughly 3% to 12%. Controlling blood pressure, not smoking, and avoiding cocaine lower that risk, and future pregnancies are watched more closely.

What you can do

Can it be prevented?

  • Control blood pressure

    High blood pressure and preeclampsia are the leading medical risk factors, so keeping blood pressure well controlled before and during pregnancy is the most important step you can take.

  • Do not smoke or use cocaine

    Both sharply raise the risk. Quitting is one of the clearest ways to protect the pregnancy.

  • Wear a seatbelt and report any trauma

    Always buckle up, and after any blow or injury to your belly, get evaluated even if you feel fine, since abruption can follow trauma.

Who is more at risk

Risk factors

High blood pressure and preeclampsia
The strongest medical risk factors, because they injure the small vessels supplying the placenta.
A prior abruption
Having had one is a major risk factor for another.
Recurrence of about 3% to 12%
Trauma
A car accident, fall, or blow to the abdomen can trigger an abruption.
Smoking and cocaine
Both raise the risk considerably; cocaine use is associated with a risk as high as roughly 10%.
Other factors
Preterm rupture of membranes, carrying multiples, advanced maternal age, and clotting disorders (thrombophilias) also increase risk.

Do not wait

When to call your provider or 911

  • Call 911 or go to labor and delivery immediately for sudden or severe belly or back pain, especially with a hard, tender uterus.
  • Go in now for vaginal bleeding in the second half of pregnancy, particularly with pain.
  • Seek emergency care for severe belly pain even if you do not see much bleeding, because blood can be trapped behind the placenta.
  • Call right away if your baby is moving less than usual, or if you feel faint, dizzy, or pale.
  • After any car accident, fall, or blow to the belly, be evaluated even if you feel well.

Talking to your team

Questions to ask your provider

  • How severe is the abruption, and how are my baby and I doing right now?
  • Do I need to deliver now, and if so, will it be a cesarean?
  • If it is too early to deliver, what is the plan and what should I watch for?
  • Will I need steroids for my baby's lungs or a blood transfusion?
  • If I am Rh negative, do I need a RhoGAM shot?
  • What raises my risk of this happening again, and how will my next pregnancy be monitored?

Keep reading

More on placental abruption

All pregnancy guides articles

Good to Know

Placental abruption FAQs

Common questions about placental abruption, answered.

Is placental abruption an emergency?

Yes. A separation quickly threatens your baby's oxygen supply and bleeds heavily for you. Sudden belly pain with bleeding in the second half of pregnancy means calling 911 or going straight to labor and delivery.

Can I have an abruption without seeing any blood?

Yes. Blood can stay trapped between the placenta and the uterine wall, so there may be little or no visible bleeding. That is why severe, constant belly pain is taken seriously even without visible blood.

Will my baby be okay?

It depends on how much separated and how fast you are treated. Many mild abruptions do well with monitoring; severe ones are dangerous, which is why urgent delivery and close monitoring protect your baby.

Will I need a cesarean?

Often, yes, especially if the abruption is severe or your baby shows distress. If you are both stable, a vaginal delivery is sometimes possible. The call is made urgently, based on how you both are doing.

What caused it?

Often no single cause is found. The strongest links are high blood pressure and preeclampsia, trauma, smoking, and cocaine use. Ordinary activity, exercise, and lifting do not cause it.

Could I have prevented it?

Usually not. You can lower your risk by controlling blood pressure, avoiding smoking and cocaine, wearing a seatbelt, and getting checked after belly trauma, but many abruptions have no preventable cause.

Will it happen again in my next pregnancy?

The risk is higher than average, around 3% to 12%. Managing blood pressure and avoiding smoking and cocaine lower it, and your next pregnancy would be watched more closely.

How is abruption different from placenta previa?

Abruption usually causes painful bleeding with a hard, tender uterus, because the placenta is tearing away. Previa usually causes painless bleeding, because the placenta sits low over the cervix. Both need urgent evaluation, but the pain pattern points the way.

Medically Reviewed · Updated

Reviewed by Dr. Grace Lin, MD, FACOG · OB-GYN

Obstetrician-gynecologist focused on reproductive and sexual health for women: pregnancy, BV, yeast, trichomoniasis and HPV/cervical screening. Our editorial guidelines →

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