HELLP Syndrome: A Serious Pregnancy Complication Explained
Updated: 2 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 15, 2026
Quick Answer
HELLP syndrome is a rare condition affecting the blood and liver during pregnancy or shortly after childbirth [1], named for hemolysis, elevated liver enzymes and low platelet count. It is often considered a severe form of preeclampsia [1]. Symptoms include upper right abdominal pain, blurred vision and severe headaches [1]. The only definitive treatment is delivery of the baby [1].
What the research says
HELLP is rare. A systematic review pooling nine studies (133,611 participants) estimated the global prevalence of HELLP syndrome at 0.39% (95% CI 0.16% to 0.72%), compared with 4.43% for preeclampsia, with the authors cautioning that the HELLP estimate rests on a small pool of studies (Vera-Ponce et al., Front Reprod Health, 2025) [2].
It can strike after delivery, and timing guides treatment. A clinical review reported that about 70% of cases develop before delivery and the rest within 48 hours afterward, that HELLP occurs in 10% to 20% of severe preeclampsia, and that delivery is indicated when it occurs after the 34th week or the mother's or baby's condition worsens (Haram et al., BMC Pregnancy Childbirth, 2009) [3].
Steroids for the mother remain unproven. In a meta-analysis of 15 trials (821 women), the effect of corticosteroids on maternal death was uncertain (risk ratio 0.77, 95% CI 0.25 to 2.38, very low certainty evidence), so prompt delivery stays the mainstay of care (Kasem et al., BMC Pregnancy Childbirth, 2024) [4].
Overview of HELLP Syndrome
HELLP syndrome is a rare medical condition that mainly impacts the blood and liver functions of a pregnant person. While it most frequently appears during the third trimester (between 28 and 40 weeks), it can manifest as early as 20 weeks into the pregnancy or even within the first week following childbirth. The condition is very rare, affecting only 0.1% to 0.6% of all pregnancies [1].
Key Takeaways: HELLP Syndrome Facts
Feature | Details |
Acronym Meaning | Hemolysis, Elevated Liver enzymes, Low Platelets [1]. |
Occurrence | 0.1% to 0.6% of all pregnancies. |
Timing | Usually 3rd trimester; can be postpartum [1]. |
Relationship | Severe form of preeclampsia (in ~20% of cases). |
Primary Treatment | Delivery of the baby. |
Prognosis | Good with early detection and hospital care [1]. |
Symptoms and Clinical Signs
The symptoms of HELLP syndrome can be similar to preeclampsia, but some signs are specifically indicative of liver involvement. Because these symptoms can mimic other common conditions, it is crucial to report any unusual changes to a healthcare provider immediately.
Common symptoms include:
Right Upper Abdominal Pain: A specific sign of liver distress in HELLP syndrome.
Severe Headaches: Often persistent and not relieved by standard measures.
Vision Changes: Including blurred vision or light sensitivity.
Gastrointestinal Issues: Nausea and vomiting, sometimes mistaken for the flu.
Physical Swelling: Rapid weight gain and edema (swelling) in the face or limbs [1].
Respiratory Distress: Pain when taking deep breaths or general fatigue [1].
Causes and Risk Factors
The exact cause of HELLP syndrome remains unknown, but it is closely linked to preeclampsia and eclampsia [1]. Understanding the risk factors can help healthcare providers monitor high-risk individuals more effectively.
Risk Factors for Development
People with severe preeclampsia in the current pregnancy are at the highest risk, with about 1 in 10 to 1 in 5 developing HELLP syndrome [1]. Other factors include:
Potential Complications
HELLP syndrome can lead to serious health issues for both the birthing parent and the fetus if not managed promptly in a hospital setting.
Maternal Complications
Blood Clotting Disorders: Including Disseminated Intravascular Coagulation (DIC), which can lead to severe postpartum hemorrhage [1].
Organ Failure: Specifically kidney or liver failure [1].
Placental Abruption: The premature separation of the placenta from the uterus [1].
Pulmonary Edema: Fluid buildup in the lungs causing breathing difficulties [1].
Fetal Complications
Diagnosis and Classification
Healthcare providers diagnose HELLP syndrome through physical examinations and specific laboratory tests. A key diagnostic feature is the presence of the three namesake blood markers.
Diagnostic Tests
Complete Blood Count (CBC): To check for low platelet counts and red blood cell breakdown [1].
Liver Function Tests: To identify elevated enzymes indicating liver stress [1].
Kidney Function Tests: To monitor overall organ health [1].
Imaging: Ultrasounds or CT scans may be used to check for liver enlargement or bleeding [1].
Severity Classification
Providers often classify the condition based on the platelet count:
Class I: Severe (lowest platelet count).
Class II: Moderate.
Class III: Mild [1].
Treatment and Management
Delivery is the only definitive treatment for HELLP syndrome [1]. Once the baby is born, the parent's symptoms usually begin to resolve within 72 hours [1].
Hospital Interventions
If the pregnancy has reached 34 weeks or the parent's condition is unstable, immediate delivery is typically recommended [1] [3]. For pregnancies less than 34 weeks, providers may attempt to delay delivery slightly to allow for fetal development using:
Prognosis and Recovery
The outlook for HELLP syndrome is generally positive when the condition is identified and treated early. The risk of serious complications drops below 25% with timely hospital care [1]. Most parents see their blood counts return to normal within a few days of delivery. Regular prenatal checkups are the most effective way to ensure early detection of this and other pregnancy complications [1].
Frequently Asked Questions
What does HELLP stand for?
It stands for Hemolysis, Elevated Liver enzymes, and Low Platelet count.
Is HELLP syndrome the same as preeclampsia?
It is considered a severe form or a variant of preeclampsia, but it can sometimes occur without high blood pressure.
How rare is HELLP syndrome?
It occurs in approximately 0.1% to 0.6% of all pregnancies.
When does it usually occur?
Most cases happen in the third trimester, but it can occur after 20 weeks or shortly after birth.
Can HELLP syndrome happen after delivery?
Yes, it can develop in the first seven days following childbirth.
What is the main treatment for HELLP?
The only definitive cure is the delivery of the baby and the placenta.
What is hemolysis?
Hemolysis is the premature breakdown of red blood cells, which carry oxygen through the body.
Why are liver enzymes elevated?
The inflammation associated with HELLP syndrome causes the liver to release higher levels of enzymes into the blood.
What are platelets?
Platelets are the components in your blood that help it clot to stop bleeding.
What is the most common symptom?
Pain in the upper right quadrant of the abdomen is a hallmark sign.
Can I have HELLP without high blood pressure?
Yes, about 20% of cases occur without elevated blood pressure or protein in the urine.
Is HELLP syndrome hereditary?
While not strictly hereditary, a family history of preeclampsia may increase your risk.
Can HELLP syndrome be prevented?
There is no known way to prevent it, but regular prenatal care allows for early detection.
What are the risks to the baby?
The main risks are related to premature birth and potential blood disorders.
How long does recovery take?
Most symptoms and blood markers return to normal within three days after delivery.
Can I have a vaginal birth with HELLP?
Yes, a vaginal birth is often possible unless the parent's or baby's condition requires an emergency C-section.
What is DIC?
Disseminated Intravascular Coagulation is a serious clotting disorder that can occur as a complication of HELLP.
Does HELLP syndrome affect future pregnancies?
There is an increased risk of recurrence in future pregnancies, requiring close monitoring.
Can HELLP syndrome be fatal?
It can be life-threatening if left untreated, but modern medical care makes this very rare.
What is the “Class I” designation?
It indicates the most severe form of HELLP syndrome based on the lowest platelet count.
Why are steroids given?
Steroids help speed up the development of the baby's lungs if an early delivery is necessary.
Can HELLP syndrome cause seizures?
Yes, if it progresses to eclampsia, seizures can occur.
What is magnesium sulfate used for?
It is a medication used to prevent seizures in patients with severe preeclampsia or HELLP.
Does HELLP syndrome cause permanent liver damage?
Usually no; the liver function typically returns to normal shortly after the baby is delivered.
Is HELLP syndrome more common in older parents?
Yes, being over the age of 35 is considered a risk factor.
Can I breastfeed after having HELLP?
Yes, in most cases, breastfeeding is safe once the parent is stable.
What causes the abdominal pain?
The pain is often caused by the liver swelling or the liver capsule being stretched.
How is the baby monitored during HELLP?
Through ultrasounds, nonstress tests, and biophysical profiles.
Can HELLP syndrome cause kidney failure?
Yes, it is a potential maternal complication if the condition is severe.
What is placental abruption?
It is when the placenta peels away from the inner wall of the uterus before delivery.
Are nosebleeds a sign of HELLP?
Uncontrolled nosebleeds can be a rare sign of very low platelet levels.
Can HELLP syndrome be mistaken for the flu?
Yes, symptoms like nausea and vomiting can sometimes lead to a misdiagnosis.
What is an IUGR?
Intrauterine growth restriction means the baby is not growing at the expected rate inside the womb.
Can HELLP syndrome cause blurred vision?
Yes, vision changes are a common neurological symptom of the condition.
Is a blood transfusion always necessary?
No, it is only used if platelet levels become dangerously low or if there is significant bleeding.
Can I take aspirin to prevent HELLP?
Low-dose aspirin is sometimes prescribed to prevent preeclampsia, which may reduce HELLP risk.
What is the difference between HELLP and eclampsia?
Eclampsia is defined by the onset of seizures, whereas HELLP is defined by specific blood and liver markers.
Does HELLP syndrome affect the baby's platelets?
Yes, some babies are born with temporary blood disorders like low platelets.
Can HELLP syndrome cause pulmonary edema?
Yes, fluid can build up in the lungs, making it difficult to breathe.
Is HELLP syndrome more common in first pregnancies?
While preeclampsia is more common in first pregnancies, HELLP often occurs in people who have given birth before.
Can HELLP syndrome cause a stroke?
Severe high blood pressure associated with the condition can increase the risk of a stroke.
How often are blood tests done during treatment?
Tests are typically performed every few hours to monitor platelet and enzyme levels.
What is a “Class III” designation?
It refers to the mildest form of HELLP syndrome based on platelet levels.
Can HELLP syndrome cause weight gain?
Yes, rapid weight gain due to fluid retention is a common sign.
Is HELLP syndrome related to gestational diabetes?
Having diabetes is a risk factor for developing preeclampsia and HELLP.
Can HELLP syndrome cause chest pain?
Yes, some patients experience pain when taking deep breaths.
What is the “hemolysis” part of the diagnosis?
It is confirmed by looking for abnormal red blood cells on a peripheral blood smear.
Can HELLP syndrome be managed at home?
No, it is a serious condition that requires inpatient hospital management.
Does HELLP syndrome affect the heart?
While it primarily affects the liver and blood, the associated high blood pressure can strain the heart.
What is the most important thing to do if I have symptoms?
Contact your obstetrician or go to a labor and delivery triage unit immediately.
Further Reading
Preeclampsia Foundation. HELLP Syndrome. Last updated August 8, 2025.
March of Dimes. HELLP Syndrome. Last reviewed March 2025.
Related Reading
Preeclampsia: Symptoms, Causes & What Helps — A Complete Guide explains the high blood pressure disorder closely linked to HELLP syndrome.
Eclampsia: Warning Signs, Causes, Diagnosis, Treatment and When to Seek Emergency Care — What You Need to Know covers seizures in pregnancy and the warning signs to act on.
Postpartum Preeclampsia Guide: Symptoms, Causes, Diagnosis, and Treatment explains preeclampsia that develops after delivery.
Acute Fatty Liver of Pregnancy: The Rare Third-Trimester Emergency Every Pregnant Person Should Know describes another rare liver emergency of late pregnancy.
Sources
Cleveland Clinic. HELLP Syndrome. Cleveland Clinic. Last updated April 27, 2024. https://my.clevelandclinic.org/health/diseases/21637-hellp-syndrome
Vera-Ponce VJ, Loayza-Castro JA, Ballena-Caicedo J, et al. Global prevalence of preeclampsia, eclampsia, and HELLP syndrome: a systematic review and meta-analysis. Front Reprod Health. 2025;7:1706009. PMID 41293035. https://doi.org/10.3389/frph.2025.1706009
Haram K, Svendsen E, Abildgaard U. The HELLP syndrome: clinical issues and management. A Review. BMC Pregnancy Childbirth. 2009;9:8. PMID 19245695. https://doi.org/10.1186/1471-2393-9-8
Kasem AF, Alqenawy HB, Elgendi MA, et al. Corticosteroids for improving patient-relevant outcomes in HELLP syndrome: a systematic review and meta-analysis. BMC Pregnancy Childbirth. 2024;24(1):487. PMID 39026148. https://doi.org/10.1186/s12884-024-06665-y
Disclaimer
The information provided in this article is for educational purposes only and is not intended as medical advice. Always consult with a qualified healthcare professional for diagnosis and treatment of any health condition.
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