Eclampsia and Preeclampsia: Causes, Symptoms, Diagnosis, Treatment, and Prevention

Introduction 

Preeclampsia and eclampsia are serious pregnancy-related conditions that require early recognition, appropriate medical care, and careful monitoring. Although they are closely related, they are not the same condition. Preeclampsia involves high blood pressure and may affect organs such as the kidneys, liver, and brain, while eclampsia is characterized by seizures associated with preeclampsia. Both conditions can threaten the health of the pregnant woman and her baby, particularly when warning signs are missed or treatment is delayed. The World Health Organization (WHO) reported in its October 2026 fact sheet that preeclampsia affects approximately 3–8% of women who give birth worldwide, highlighting the importance of accessible antenatal care and effective emergency treatment.

Understanding these conditions can help pregnant women, families, pharmacists, nurses, and other healthcare professionals recognize warning signs and seek medical assistance promptly. In this guide, we will explore the causes, risk factors, symptoms, diagnosis, treatment, complications, and prevention of preeclampsia and eclampsia using current clinical guidance. The information is educational and does not replace an assessment by an obstetrician or other qualified healthcare professional.

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1. What Are Preeclampsia and Eclampsia?

Preeclampsia is a pregnancy complication that typically develops after 20 weeks of gestation, although it can also appear during labor or after childbirth. It is characterized by newly developed high blood pressure accompanied by protein in the urine or evidence of damage to organs such as the kidneys, liver, brain, or blood-forming system. In some cases, a pregnant woman may have no obvious symptoms, which makes routine antenatal blood pressure checks and laboratory investigations especially important. Preeclampsia can develop gradually or progress rapidly, and its severity cannot always be judged by how well a woman feels.

Eclampsia is a severe complication in which a pregnant or recently postpartum woman develops seizures associated with the preeclampsia disease process. These seizures can occur before delivery, during labor, or after the baby has been born. Eclampsia is a medical emergency because seizures may cause injury, oxygen deprivation, aspiration, stroke, or other life-threatening complications. Immediate hospital treatment is necessary to stabilize the mother, control seizures, manage severe hypertension, and determine the safest timing of delivery.

An important point is that preeclampsia does not always progress to eclampsia, and eclampsia can sometimes occur without previously recognized high blood pressure or proteinuria. Therefore, the absence of a previous diagnosis does not rule out an emergency. Recognizing severe headaches, visual disturbances, upper abdominal pain, breathing difficulties, or seizures is essential throughout pregnancy and the postpartum period.

2. Key Differences Between Preeclampsia and Eclampsia

Preeclampsia and eclampsia are part of the same spectrum of pregnancy-related hypertensive disorders, but their clinical features and immediate treatment priorities differ. Preeclampsia is diagnosed through blood pressure measurements and evidence of proteinuria or organ dysfunction. Eclampsia is identified when seizures occur in the setting of the disease and after clinicians consider other possible causes of the seizures. Understanding the distinction helps explain why some women need close monitoring while others require immediate emergency intervention.

Feature	Preeclampsia	Eclampsia
Main characteristic	High blood pressure with proteinuria or organ dysfunction	Seizures associated with preeclampsia
Typical timing	After 20 weeks of pregnancy or postpartum	During pregnancy, labor, or postpartum
Symptoms	Headache, visual changes, abdominal pain, and swelling may occur	Convulsions, impaired consciousness, and possible breathing problems
Diagnosis	Blood pressure, urine tests, blood tests, and clinical assessment	Clinical assessment of seizures and exclusion of alternative causes
Main treatment priorities	Monitor mother and fetus, control severe blood pressure, prevent seizures when indicated	Stabilize airway and breathing, control seizures, treat hypertension, assess for delivery
Role of magnesium sulfate	Prevents seizures in appropriate patients	First-line medication for controlling and preventing recurrent eclamptic seizures in standard protocols
Delivery	Timing depends on severity and gestational age	Delivery is generally planned after maternal stabilization

These differences do not mean that preeclampsia is harmless. Severe preeclampsia can damage vital organs or progress to eclampsia, stroke, or HELLP syndrome. Likewise, stopping a seizure does not mean the underlying condition has resolved. Both conditions require coordinated obstetric care, with treatment tailored to the mother's condition and the baby's gestational age.

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3. Causes and Pathophysiology of Preeclampsia

The exact cause of preeclampsia is not completely understood, but research suggests that abnormal placental development and changes in maternal blood vessel function play central roles. During a normal pregnancy, blood vessels supplying the placenta undergo changes that allow sufficient blood and oxygen to reach the developing baby. In preeclampsia, these changes may be incomplete, increasing resistance to blood flow through the placental circulation. The placenta can then release substances that disturb the mother's normal vascular function, contributing to high blood pressure and inflammation. This process can affect several organs, which explains why preeclampsia is more than simply a blood pressure problem.

How the Placenta and Blood Vessels Are Involved

One important mechanism involves an imbalance between substances that promote blood vessel formation and substances that inhibit it. Researchers have studied soluble fms-like tyrosine kinase-1 (sFlt-1) and placental growth factor (PlGF), which are involved in the regulation of blood vessel development. An increased antiangiogenic signal can impair normal endothelial function, making blood vessels less able to regulate their diameter and maintain healthy circulation. These changes contribute to hypertension and may increase leakage of fluid from blood vessels into surrounding tissues. They also help explain why preeclampsia can affect the kidneys, liver, brain, lungs, and placenta rather than remaining confined to one organ.

The kidneys may become less effective at filtering blood normally, allowing protein to enter the urine. The liver can become inflamed or injured, while changes in the brain's circulation may contribute to severe headaches, visual disturbances, or seizures. Reduced placental blood flow can also restrict fetal growth. These mechanisms are complex, and no single pathway explains every case. Current clinical diagnosis therefore relies on a woman's symptoms, blood pressure, laboratory findings, and maternal-fetal assessment rather than one isolated biological marker.

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4. Risk Factors for Preeclampsia

Preeclampsia can develop in any pregnancy, even when a woman has no known medical problems. However, certain characteristics and medical conditions increase the likelihood of developing it. Identifying these risk factors early allows healthcare professionals to recommend appropriate surveillance and preventive measures. A risk factor does not guarantee that preeclampsia will occur, and the absence of recognized risk factors does not eliminate the possibility of disease.

Important risk factors include:

• A previous history of preeclampsia, particularly if it occurred early or was severe.
• Chronic hypertension before pregnancy.
• Pre-existing diabetes or kidney disease.
• Certain autoimmune conditions, including systemic lupus erythematosus and antiphospholipid syndrome.
• Pregnancy with twins or higher-order multiples.
• A first pregnancy or a long interval between pregnancies.
• Obesity, particularly a body mass index of 30–35 or higher, depending on the guideline used.
• A family history of preeclampsia.
• Maternal age of 35 or 40 years and above, depending on the clinical guideline.

Healthcare professionals assess these factors together rather than relying on a single characteristic. For example, a woman with chronic hypertension and a previous pregnancy complicated by preeclampsia may need closer monitoring and preventive medication. A woman carrying twins may also require additional assessment because multiple pregnancy increases the risk of hypertensive complications. The care plan should be individualized according to medical history, gestational age, local guidelines, and the availability of monitoring.

 

5. Signs and Symptoms to Recognize

Preeclampsia can be difficult to recognize because some women initially feel completely well. Healthcare providers may detect high blood pressure and protein in the urine only during a routine antenatal appointment. Other women develop symptoms as the condition affects their brain, liver, lungs, kidneys, or circulation. For this reason, pregnant women should attend scheduled prenatal visits even when they feel healthy.

Common warning signs include persistent or severe headache, blurred vision, flashing lights or spots in the visual field, pain beneath the ribs or in the upper abdomen, sudden swelling of the face or hands, nausea or vomiting that develops later in pregnancy, and feeling unusually unwell. Shortness of breath may indicate fluid accumulation in the lungs and requires urgent assessment. Swelling of the feet can occur in normal pregnancy, so swelling alone does not establish a diagnosis; sudden swelling accompanied by other warning signs is more concerning.

Emergency warning signs

Seek emergency medical care if a pregnant or recently postpartum woman experiences:

• A seizure or loss of consciousness.
• A severe, persistent headache or sudden visual changes.
• Severe pain beneath the ribs or in the upper abdomen.
• Difficulty breathing or chest pain.
• Sudden weakness, confusion, or difficulty speaking.
• Blood pressure at or above 160 mm Hg systolic or 110 mm Hg diastolic.

Do not wait for every symptom to appear. Severe hypertension or a seizure requires immediate medical attention.

It is also important to understand that preeclampsia can appear after delivery. A woman who has recently given birth should not dismiss severe headaches, visual disturbances, or breathing difficulties as ordinary postpartum fatigue. If symptoms develop at home, she should contact emergency services or go to an emergency department immediately.

6. How Preeclampsia Is Diagnosed

Diagnosis involves measuring blood pressure, assessing symptoms, and checking for proteinuria or evidence of organ dysfunction. In a woman who previously had normal blood pressure, a reading of at least 140/90 mm Hg after 20 weeks of pregnancy raises concern for a hypertensive disorder. Under commonly used American College of Obstetricians and Gynecologists (ACOG) criteria, hypertension is generally confirmed by two measurements at least four hours apart, unless severe hypertension requires more rapid confirmation and treatment. A reading of at least 160 systolic or 110 diastolic is considered severe-range hypertension.

Doctors may request the following investigations:

• Urine protein testing: A 24-hour urine collection or urine protein-to-creatinine ratio can help identify significant proteinuria.
• Complete blood count: Helps assess platelet levels and possible hematological complications.
• Liver function tests: Detect elevated liver enzymes that may indicate liver involvement.
• Kidney function tests: Serum creatinine helps assess renal function.
• Fetal ultrasound: Evaluates fetal growth and amniotic fluid when indicated.
• Fetal surveillance: Heart rate monitoring and other assessments may be used according to gestational age and clinical condition.

Under ACOG criteria, significant proteinuria includes at least 300 mg of protein in a 24-hour urine collection or a urine protein-to-creatinine ratio of at least 0.3. However, proteinuria is not essential for the diagnosis when new-onset hypertension is accompanied by qualifying organ dysfunction, such as low platelets, kidney impairment, elevated liver enzymes, pulmonary edema, or persistent neurological symptoms. This distinction is important because a negative urine protein test does not automatically exclude preeclampsia.

Healthcare professionals also evaluate other potential causes of symptoms, including neurological disorders, kidney disease, and other pregnancy complications. The diagnosis should be based on the complete clinical picture rather than one laboratory result.

7. Possible Complications for Mother and Baby

Preeclampsia can affect maternal health directly and can interfere with the placenta's ability to support fetal growth. The severity of complications varies considerably. Some women remain stable with careful monitoring, while others deteriorate quickly and need urgent delivery. Early diagnosis and appropriate treatment can reduce the likelihood of serious outcomes, although they cannot eliminate every risk.

For the mother, possible complications include eclampsia, stroke, HELLP syndrome, acute kidney injury, liver injury, pulmonary edema, abnormal blood clotting, placental abruption, and, in severe cases, death. HELLP syndrome refers to hemolysis, elevated liver enzymes, and low platelet count. It is a serious complication that can occur with preeclampsia and requires urgent specialist assessment. Severe hypertension can also damage the brain and other organs even when seizures have not occurred.

For the baby, reduced placental blood flow may contribute to fetal growth restriction, low birth weight, fetal distress, and stillbirth. If the mother or baby becomes unstable, delivery may be necessary before the pregnancy reaches full term. Premature birth can introduce additional challenges, including breathing difficulties, feeding problems, temperature instability, and a need for neonatal intensive care. The medical team must balance the risks of continuing the pregnancy against the risks associated with premature delivery.

8. Treatment Options for Preeclampsia

The treatment plan depends on the severity of preeclampsia, the gestational age, maternal laboratory results, fetal wellbeing, and whether there are signs of rapid deterioration. The overall goals are to prevent stroke and seizures, monitor organ function, protect the baby where possible, and determine the safest timing of birth. There is currently no medication that reliably cures the underlying placental disorder while the pregnancy continues. Delivery of the placenta is the definitive treatment for the pregnancy-related condition, although recovery may take time and complications can persist or develop after birth.

Blood Pressure Control and Seizure Prevention

Severe hypertension requires prompt treatment to reduce the risk of maternal stroke and other complications. Commonly used medications in acute obstetric care include intravenous labetalol, intravenous hydralazine, and immediate-release oral nifedipine, selected according to the patient's condition and the local protocol. Longer-term blood pressure management may involve labetalol or extended-release nifedipine, among other options selected by the treating clinician. ACE inhibitors and angiotensin receptor blockers are generally avoided during pregnancy because of potential fetal harm.

Magnesium sulfate is a key medication for preventing eclamptic seizures in patients with preeclampsia who meet clinical criteria and for treating eclamptic seizures. It is an anticonvulsant, not an antihypertensive, so it does not replace medication used to control severe blood pressure. When preterm delivery is anticipated, antenatal corticosteroids may be administered when appropriate to help accelerate fetal lung maturation, but they do not treat preeclampsia itself.

Management may involve hospital admission, repeated blood pressure measurements, laboratory testing, assessment of symptoms, and fetal monitoring. Selected women with preeclampsia without severe features may be monitored closely as outpatients if the obstetric team considers this safe and reliable follow-up is available. Severe features, uncontrolled hypertension, worsening laboratory results, or fetal compromise generally require hospital-level care.

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9. Emergency Management of Eclampsia

Eclampsia is a life-threatening obstetric emergency. Treatment begins with maternal stabilization rather than attempting to deliver the baby during an active seizure. The team protects the woman from injury, positions her on her side when feasible, assesses her airway and breathing, provides oxygen if clinically indicated, and establishes appropriate monitoring and intravenous access. Staff should not restrain her forcefully or put objects, fingers, or medicines into her mouth during a seizure.

Magnesium sulfate is the preferred first-line medication for controlling eclamptic seizures and preventing recurrence in standard obstetric protocols. The exact intravenous or intramuscular regimen depends on the hospital protocol, clinical circumstances, and available monitoring. If seizures continue or another cause is suspected, clinicians may need additional treatment and urgent neurological assessment. Severe hypertension must also be treated promptly, and the team evaluates for complications such as stroke, aspiration, pulmonary edema, and kidney injury.

Because magnesium sulfate can cause toxicity, clinicians monitor respiratory rate, deep tendon reflexes, urine output, and the patient's overall clinical status. Calcium gluconate may be used as an antidote in significant magnesium toxicity under medical supervision. Once the woman is stabilized, the obstetric team assesses maternal and fetal status and plans delivery when appropriate. Emergency care must not be delayed while waiting for all test results.

10. When Is Delivery Recommended?

The timing of delivery is one of the most important decisions in managing preeclampsia. Clinicians consider how far the pregnancy has progressed, whether the mother's blood pressure is controlled, whether organ dysfunction is developing, and whether the baby is showing signs of distress. Continuing the pregnancy may provide the baby with more time to develop, but it can also expose the mother and baby to increasing risks if the disease worsens. The decision therefore requires individualized assessment by an obstetric team rather than a single rule applied to every patient.

For preeclampsia without severe features, expectant monitoring may be appropriate before 37 weeks when maternal and fetal conditions remain stable. Delivery is generally recommended at 37 weeks for gestational hypertension or preeclampsia without severe features under commonly used ACOG guidance. When severe features are present, delivery is generally recommended from 34 weeks after maternal stabilization; earlier delivery may be necessary if the mother's or baby's condition deteriorates. In eclampsia, maternal stabilization and preparation for delivery are urgent priorities, regardless of whether the pregnancy has reached full term.

Delivery does not mean that every symptom will disappear immediately. Blood pressure can remain elevated, and eclampsia or postpartum preeclampsia can develop after the baby is born. The mother may need continued observation, antihypertensive treatment, magnesium sulfate when indicated, and follow-up appointments. Neonatal care may also be needed if the baby is born prematurely.

11. Prevention and Antenatal Care

There is no guaranteed way to prevent every case of preeclampsia, but appropriate prenatal care and selected preventive measures can reduce risk in eligible women. Antenatal appointments allow healthcare professionals to identify risk factors, measure blood pressure, investigate symptoms, and monitor fetal development. Women with chronic hypertension, diabetes, kidney disease, previous preeclampsia, or other recognized risk factors should discuss a prevention plan with their obstetrician early in pregnancy.

Low-dose aspirin is recommended for pregnant women who meet guideline-based risk criteria. Depending on the guideline and country, the prescribed dose may vary; recommendations commonly range from 75–150 mg daily, with initiation around 12 weeks or as early as appropriate before 20 weeks. Aspirin should be started only after a healthcare professional assesses the patient's suitability, including contraindications and bleeding risks. It should not be self-prescribed during pregnancy.

Calcium supplementation may also reduce the risk of preeclampsia in populations with low dietary calcium intake. The WHO recommends calcium supplementation during pregnancy in populations with low calcium intake, according to applicable guidance. A balanced diet, appropriate physical activity, management of existing medical conditions, and attendance at prenatal appointments support general maternal health, but these measures cannot guarantee prevention. Women should ask their healthcare professional which interventions are appropriate for their individual circumstances.

12. Postpartum Preeclampsia and Long-Term Health

Preeclampsia is not limited to the months before delivery. Some women develop postpartum preeclampsia after an apparently uncomplicated pregnancy, while others experience persistent or worsening disease after childbirth. It commonly appears in the first several days after delivery but can develop later in the postpartum period. Because families may expect pregnancy-related risks to end at birth, warning signs can be overlooked or mistaken for ordinary recovery symptoms.

Women should seek urgent medical evaluation for a severe or persistent headache, visual changes, upper abdominal pain, shortness of breath, or markedly elevated blood pressure after childbirth. Treatment may involve antihypertensive medication, magnesium sulfate when indicated, laboratory investigations, and hospital observation. Breastfeeding plans and medication selection can be discussed with the healthcare team so that maternal treatment and infant feeding needs are addressed together.

A history of preeclampsia is also associated with an increased risk of future cardiovascular disease, including chronic hypertension and cardiovascular events. This does not mean that every woman will develop these problems, but it makes long-term follow-up important. Women who have experienced preeclampsia should discuss blood pressure monitoring, cardiovascular risk assessment, healthy lifestyle habits, and future pregnancy planning with their healthcare professionals.

13. The Role of Pharmacists and Healthcare Professionals

Pharmacists, nurses, midwives, physicians, and obstetric specialists all contribute to the prevention and management of pregnancy-related hypertensive disorders. Pharmacists can support safe medication use by reviewing prescribed therapies, identifying potentially harmful medicines, checking interactions, and educating patients about treatment adherence. They can also help patients understand why antihypertensive medicines may be necessary even when high blood pressure does not cause noticeable symptoms. In hospital settings, pharmacists contribute to medication safety by supporting appropriate dosing, monitoring requirements, and emergency drug availability.

Magnesium sulfate is particularly important from a medication-safety perspective because it requires appropriate administration and clinical monitoring. Pharmacists can help verify the prescribed concentration, infusion rate, dosing regimen, compatibility, and availability of calcium gluconate where required by protocol. They should also support clear communication among obstetricians, nurses, and other team members to reduce the risk of medication errors. These activities are especially important in emergency settings where rapid decisions and multiple simultaneous interventions may be necessary.

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Patient education is another essential responsibility. Healthcare professionals should explain warning signs in language that patients and families can understand, encourage attendance at prenatal and postpartum appointments, and reinforce the need for immediate assessment when danger signs occur. Coordinated care and reliable referral pathways are vital because early recognition alone cannot prevent complications if access to effective treatment is delayed.

Conclusion

Preeclampsia and eclampsia are serious pregnancy-related conditions that require early recognition, accurate diagnosis, and timely medical management. Preeclampsia typically involves new-onset hypertension with proteinuria or other evidence of organ dysfunction, while eclampsia involves seizures associated with the disease. Both conditions can develop during pregnancy, labor, or after delivery, making antenatal and postpartum monitoring essential.

The most important management priorities are controlling severe hypertension, preventing or treating seizures with magnesium sulfate when indicated, monitoring maternal and fetal wellbeing, and determining the safest time for delivery. Preventive measures such as low-dose aspirin for eligible high-risk women and calcium supplementation in populations with low dietary calcium intake can also play a role. Women and their families should recognize emergency warning signs and seek medical attention without delay.

With appropriate prenatal care, evidence-based treatment, and effective communication between patients and healthcare professionals, many complications can be prevented or reduced. Awareness is not simply about understanding a medical condition; it is about recognizing when urgent action can save the lives of both mother and baby.

Frequently Asked Questions (FAQs)

1. What is the main difference between preeclampsia and eclampsia?

Preeclampsia is a pregnancy-related disorder characterized by high blood pressure with proteinuria or other signs of organ dysfunction. Eclampsia occurs when seizures develop in association with preeclampsia. Eclampsia is a medical emergency requiring immediate treatment.

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2. Can preeclampsia occur without protein in the urine?

Yes. Proteinuria is not essential for diagnosis if a woman has new-onset hypertension accompanied by other qualifying signs of organ dysfunction, such as low platelet counts, kidney impairment, liver dysfunction, pulmonary edema, or certain neurological symptoms.

3. What is the first-line medicine for eclampsia?

Magnesium sulfate is the preferred first-line medication for treating eclamptic seizures and preventing recurrent seizures. Severe hypertension must also be treated with appropriate antihypertensive medication. These treatments require medical supervision and monitoring.

4. Can preeclampsia develop after childbirth?

Yes. Postpartum preeclampsia can develop after delivery, including in women who did not receive a diagnosis during pregnancy. A severe headache, visual disturbances, upper abdominal pain, difficulty breathing, or seizures after childbirth require urgent medical evaluation.

5. Can preeclampsia be prevented?

Not every case can be prevented, but some women can reduce their risk through appropriate antenatal care, prescribed low-dose aspirin for eligible high-risk patients, and calcium supplementation when dietary calcium intake is low. Preventive treatment should be selected by a qualified healthcare professional.

References and Further Reading

1.     World Health Organization (WHO). Pre-eclampsia — Fact Sheet.

2.     American Heart Association. 2025 Guideline on the Prevention, Detection, Evaluation, and Management of High Blood Pressure in Adults.

3.     National Health Service (NHS). Pre-eclampsia.

4.     National Institutes of Health (NIH). Preeclampsia and Eclampsia.

5.     World Health Organization. WHO Recommendations on Maternal Health Guidelines.