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HELLP syndrome

HELLP syndrome is a group of symptoms that occur in pregnant women who have:

Causes of HELLP syndrome

The cause of HELLP syndrome has not been found.

HELLP syndrome occurs in about 1 to 2 out of 1,000 pregnancies. In women with preeclampsia or eclampsia, the condition develops in 10 to 20% of pregnancies.

Most often HELLP develops during the third trimester of pregnancy (between 26 to 40 weeks gestation) Sometimes it develops in the week after the baby is born.

Many women have high blood pressure and are diagnosed with preeclampsia before they develop HELLP syndrome. In some cases, HELLP symptoms are the first warning of preeclampsia. The condition is sometimes misdiagnosed as:

HELLP syndrome Symptoms

Symptoms include:

  • Fatigue or feeling unwell
  • Fluid retention and excess weight gain
  • Headache
  • Nausea and vomiting that continues to get worse
  • Pain in the upper right or mid part of the abdomen
  • Blurry vision
  • Nosebleed or other bleeding that will not stop easily (rare)
  • Seizures or convulsions (rare)

Tests and Exams

During a physical exam, the doctor may discover:

Liver function tests (liver enzymes) may be high. Platelet counts may be low. A CT scan may show bleeding into the liver.

Tests of the baby's health will be done. Tests include fetal non-stress test, ultrasound, among others.

Treatment of HELLP syndrome

The main treatment is to deliver the baby as soon as possible, even if the baby is premature. Problems with the liver and other complications of HELLP syndrome can quickly get worse and be harmful to both the mother and child.

Your health care provider may induce labor by giving you medicines to start labor, or may perform a C-section.

You may also receive:

  • A blood transfusion if bleeding problems become severe
  • Corticosteroid medicines to help the baby's lungs develop faster
  • Medicines to treat high blood pressure
  • Magnesium sulfate infusion to prevent seizures

Prognosis (Outlook)

Outcomes are most often good if the problem is diagnosed early. It is very important to have regular prenatal checkups. You should also let your health care provider know right away if you have symptoms of this condition.

When the condition is not treated early, up to 1 of 4 women develop serious complications. Without treatment, a small number of women die.

The death rate among babies born to mothers with HELLP syndrome depends on birth weight and the development of the baby's organs, especially the lungs. Many babies are born prematurely (born before 37 weeks of pregnancy).

HELLP syndrome may return in up to 1 out of 4 future pregnancies.

Potential Complications

There can be complications before and after the baby is delivered, including:

After the baby is born, HELLP syndrome goes away in most cases.

When to Contact a Health Professional

If symptoms of HELLP syndrome occur during pregnancy:

  • See your health care provider right away.
  • Call the local emergency number (such as 911).
  • Get to the hospital emergency room or labor and delivery unit.

There is no known way to prevent HELLP syndrome. All pregnant women should start prenatal care early and continue it through the pregnancy. This allows the provider to find and treat conditions such as HELLP syndrome right away.


Sibai BM. Hypertension. In: Gabbe SG, Niebyl JR, Simpson JL, eds. Obstetrics - Normal and Problem Pregnancies. 6th ed. Philadelphia, PA: Elsevier Saunders; 2012:chap 35.

Wakim-Fleming J. Liver disease in pregnancy. In: Carey WD, ed. Cleveland Clinic: Current Clinical Medicine 2010. 2nd ed. Philadelphia, PA: Elsevier Saunders; 2010:section 6.

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Review Date: 11/14/2014
Reviewed By: Cynthia D. White, MD, Fellow American College of Obstetricians and Gynecologists, Group Health Cooperative, Bellevue, WA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.
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