Also Known As
Pregnancy-induced Hypertension
This article was last reviewed on
This article waslast modified on November 12, 2019.
What is pre-eclampsia?

Pre-eclampsia is one of the most serious conditions affecting pregnant women. It is diagnosed when a woman develops high blood pressure (hypertension), protein in her urine (proteinuria), and/or swelling of the hands, feet and/or face during pregnancy. In severe cases, there may be evidence of damage to the kidneys or liver, accumulation of fluid in the lungs, or disturbances of the central nervous system. About 3 to 7 percent of pregnant women develop pre-eclampsia, which can occur after week 20 of pregnancy.

Untreated pre-eclampsia is dangerous because it can harm the mother's organs and lead to seizures. If these seizures, called eclampsia, aren't treated right away, they are usually fatal for a woman and her baby. Pre-eclampsia or eclampsia can also lead to low birth weight in the baby, premature delivery, which can cause health problems in the baby, or placental abruption, in which the placenta comes loose from the uterus before the baby is born, causing bleeding.

Pre-eclampsia can also progress to HELLP syndrome, another life-threatening condition. It is called HELLP because it is defined by the breakdown of red blood cells (Hemolysis), Elevated Liver enzymes and a Low Platelet count.

One out of every 200 women with untreated pre-eclampsia progresses to eclampsia. Most cases of eclampsia occur in the third trimester of pregnancy or within 4 days after delivery. Rarely, it may develop up to 6 weeks after delivery.

Pre-eclampsia sometimes causes symptoms that are very similar to those of normal pregnancy. Some women with pre-eclampsia may have no symptoms at all. That is why it is important to regularly attend all prenatal checkups. During the checkup, the healthcare practitioner will do a physical exam and perform laboratory tests to look for the "silent" signs of pre-eclampsia, like high blood pressure and protein in the urine.

Accordion Title
About Pre-eclampsia
  • Risk Factors

    Researchers are still trying to establish the exact cause of pre-eclampsia. However, it is associated with certain risk factors. These include:

    • A past pregnancy with pre-eclampsia
    • A family history of pre-eclampsia
    • Being pregnant for the first time
    • Being older than age 35 at the time of pregnancy
    • Obesity
    • Carrying multiple babies
    • A history of other conditions, including chronic high blood pressure, migraine headaches, type 1 or type 2 diabetes, kidney disease, a hypercoagulable state (increased tendency for blood to clot), antiphospholipid syndrome, or lupus
  • Signs and Symptoms

    Pre-eclampsia is a serious complication of pregnancy that can develop with no obvious symptoms. If symptoms are present, they may seem similar to those experienced during normal pregnancy. For example, weight gain and swelling are pre-eclampsia symptoms that also occur during normal pregnancies. High blood pressure is a sign of pre-eclampsia that typically goes unnoticed until a healthcare practitioner detects it during a routine pre-natal visit.

    If you have symptoms associated with pre-eclampsia or notice sudden changes in your pregnancy, it is important that you let your healthcare provider know right away. He or she will look for other signs of pre-eclampsia and help monitor your symptoms. Untreated pre-eclampsia is a serious condition that can be fatal for you and your baby. Be sure to attend all pre-natal checkups and seek medical attention if symptoms arise.

    Symptoms of pre-eclampsia may include:

    • Sudden weight gain of more than 2 pounds in a week
    • Sudden face and hand swelling (edema)
    • Persistent headaches
    • Vision changes: temporary loss, blurry vision, flashing light sensations, or light sensitivity
    • Bluish skin resulting from poor circulation
    • Nausea or vomiting, especially if it suddenly appears after mid-pregnancy
    • Decreased urine output
    • Shortness of breath caused by fluid in the lungs or increased blood pressure
    • Shoulder pain or stomach pain or pinching, especially in the upper right side of your abdomen or when laying on your right side—may indicate liver problems

    Some signs of pre-eclampsia that may be detected during a physical exam include:

    • Elevated blood pressure
    • Unusually strong leg reflexes (i.e., when a healthcare practitioner taps your knee with a rubber hammer)

    Blurred vision, severe headaches, abdominal pain, and shortness of breath are all serious symptoms of pre-eclampsia. If you have any of these symptoms you should seek immediate medical care.

  • Complications

    If left untreated, pre-eclampsia can lead to serious and life-threatening complications for a mother and her baby.

    Possible complications include:

    • Seizure (eclampsia)
    • Liver rupture
    • Stroke
    • Low birth weight in the baby
    • Placental abruption (the placenta comes loose from the uterus before the baby is born and causes bleeding)

    Women with a history of pre-eclampsia are more likely to develop:

  • Tests

    There is currently no one reliable test for pre-eclampsia early in pregnancy. The American College of Obstetricians and Gynecologists (ACOG) recommends that healthcare practitioners screen for pre-eclampsia in the first trimester by taking a detailed medical history and assessing women for risk factors.

    During routine prenatal exams, a healthcare practitioner will look for signs and symptoms of preeclampsia, including high blood pressure, hand and face swelling, and unusual weight gain. In the second and third trimesters, urine is tested for high amounts of protein, a possible sign of pre-eclampsia.

    If you have signs or symptoms of pre-eclampsia, your healthcare provider will do additional laboratory and imaging tests to diagnose pre-eclampsia and determine its severity.

    Laboratory Tests

    Protein in the urine (proteinuria) was once considered a diagnostic sign of pre-eclampsia. However, not all women with pre-eclampsia will have proteinuria. ACOG no longer considers proteinuria as a necessary sign for diagnosing pre-eclampsia. Now, a healthcare practitioner will look for high blood pressure along with proteinuria, or high blood pressure plus one of a number of other signs and symptoms, including a low platelet count, poor kidney function, poor liver function, severe changes in vision, or edema.

    The following tests will help to diagnose pre-eclampsia, determine its severity, and monitor its progression:

    HELLP syndrome is a life-threatening variant of pre-eclampsia that is defined by Hemolysis (the breakdown of red blood cells) Elevated Liver enzymes, and a Low Platelet count. If your healthcare practitioner suspects you may have HELLP syndrome, the following tests may be done:

    • Peripheral blood smear – red blood cells are examined with a microscope for damage or abnormalities.
    • Serum lactate dehydrogenase (LD) – elevated LD levels indicate tissue or cell damage, as occurs in the breakdown of red blood cells.
    • Total bilirubin – elevated levels of bilirubin are an indication of liver damage or red blood cell hemolysis.

    Non-Laboratory Tests

    • Ultrasonography – used to assess the baby's health, make sure pre-eclampsia isn't restricting the baby's growth, and check for blood flow in the umbilical cord
    • Non-stress test – a non-invasive test used to monitor the baby’s health by checking the heart rate and oxygen supply
  • Treatment and Prevention


    Delivering your baby is a way to cure pre-eclampsia (though the condition can also develop after delivery). In deciding when to deliver, your healthcare provider will try to minimize your risk from pre-eclampsia while allowing your baby the maximum time to mature.

    If your pregnancy is far enough along (usually at least 37 weeks), your healthcare provider may recommend delivery to reduce the risk of your condition progressing to eclampsia. You may need to undergo a Cesarean section (C-section) or medication to induce labor.

    If it is too early to deliver your baby, you may be able to manage pre-eclampsia at home. In this case, your healthcare provider will recommend bed rest, staying well hydrated, and eating less salt. Sometimes you may be given medication to reduce your blood pressure.

    If you are hospitalized for pre-eclampsia, you and your baby will be closely monitored. You may be given medicine to lower your blood pressure and prevent seizures. If your pregnancy is less than 34 weeks, you may be given steroid injections to help speed up your baby's lung development since an early delivery is more likely.

    Untreated pre-eclampsia is a dangerous condition for you and your baby. It is important that you regularly attend your prenatal checkups and call your healthcare practitioner if you have symptoms of pre-eclampsia.


    While many risk factors for pre-eclampsia cannot be controlled, there are some things you can do to reduce your risk of high blood pressure:

    • Avoid additional salt in your meals
    • Drink 6 to 8 glasses of water per day
    • Avoid fried and processed foods
    • Exercise regularly

    The U.S. Preventive Services Task Force recommends that pregnant women with risk factors for pre-eclampsia and no history of adverse reactions to aspirin take a low dose of aspirin (81 mg) each day after the 12th week of pregnancy.

View Sources

Bainbridge, S.A and Roberts, J.M. (2008, March). Uric Acid as a Pathogenic Factor in Preeclampsia. HHS Public Access. Available online at Accessed 1/31/2016.

Mayo Clinic Staff. (2013 February 27). Nonstress Test. Mayo Clinic. Available online at Accessed 1/31/2016.

Roberts, J.M., et al. (2013) Hypertension in Pregnancy. The American College of Obstetricians and Gynecologists. The Available online at Accessed 1/31/2016.

Dulay, A.T. (Reviewed 2014 January). Preeclampsia and Eclampsia. Merck Manual. Available online at Accessed 1/31/2016.

Mayo Clinic Staff. (2014 July 3). Preeclampsia. Mayo Clinic. Available online at Accessed 1/31/2016.

White, C. (Updated 2014 July 28). Preeclampsia. MedlinePlus. Available online at Accessed 1/31/2016.

(2014 September). Frequently Asked Questions: Preeclampsia and High Blood Pressure During Pregnancy. American College of Obstetricians and Gynecologists. Available online at Accessed 1/31/2016.

LeFevre , M.L. (2014 December 2). Aspirin to Prevent Preeclampsia-Related Complications and Death: U.S. Preventive Services Task Force Recommendation Statement. Annals of Internal Medicine. Available online at Accessed 1/31/2016.

(2015 March 24). HELLP Syndrome. Preeclampsia Foundation. Available online at Accessed 1/31/2016.

(Updated 2015 August). Preeclampsia. American Pregnancy Association. Available online at Accessed 1/31/2016.

Umasatyasri, Y., Vani, I., Shamita, P. (2015 September 9) Role of LDH (Lactate dehydrogenase) in preeclampsia – eclampsia as a prognostic marker: An observational study. International Archives of Integrated Medicine. Available online at Accessed 1/31/2016.

Committee on Obstetric Practice. (2015, September). Committee Opinion Summary No. 638: First-Trimester Risk Assessment for Early-Onset Preeclampsia. Obstetrics & Gynecology. Available online at Accessed 1/31/2016.

Lim, K-H. (Updated 2015 December 28). Preeclampsia. Medscape. Available online at Accessed 1/31/2016.

Ross, M (Updated 2015 December 28). Eclampsia. Medscape. Available online at Accessed 2/16/16.