Preeclampsia is a pregnancy complication that develops after 20 weeks. It involves high blood pressure — 140/90 mmHg or higher — along with signs that organs (kidneys, liver, brain) are under stress. It affects roughly 5–8% of pregnancies in the United States, which works out to about 300,000 women per year.
The thing that makes preeclampsia dangerous is how suddenly it can escalate. A routine prenatal appointment can reveal numbers that require urgent intervention within hours. This is not a condition that waits for your next scheduled visit.
What Causes Preeclampsia
The exact cause isn't fully understood, but it begins in the placenta. Early in pregnancy, blood vessels form to supply the placenta with blood. In preeclampsia, those vessels don't develop properly — they stay narrow and react poorly to blood flow. This creates abnormal pressure that eventually affects the entire cardiovascular system.
Because the root cause is in the placenta, the only way to resolve preeclampsia is to deliver the baby. Until delivery, the goal is to manage blood pressure, watch for complications, and keep the pregnancy going as safely as possible — ideally until the baby is mature enough to do well outside the womb.
Symptoms to Know
Many women with preeclampsia feel fine, especially early on. Regular blood pressure checks at prenatal appointments exist precisely to catch it before symptoms appear. But when symptoms do develop, they include:
- Severe headache that doesn't improve with acetaminophen (Tylenol)
- Vision changes — blurry vision, seeing flashing lights or spots, or temporary loss of vision
- Upper abdominal pain, especially on the right side under the ribs — this can signal liver involvement
- Sudden swelling of the face, hands, or feet (some ankle swelling is normal in pregnancy; sudden or severe facial/hand swelling is not)
- Nausea or vomiting in the second half of pregnancy, when morning sickness has typically resolved
- Shortness of breath — a sign of fluid building in the lungs
Having one of these symptoms doesn't mean you have preeclampsia. But having any of them in the second half of pregnancy warrants a call to your provider — the same day.
When to Call Your Doctor Right Now
Don't wait for your next scheduled appointment if you experience:
- A blood pressure reading of 140/90 or higher
- A severe headache that won't go away
- Any vision changes
- Upper right abdominal pain
- Sudden significant swelling of your face or hands
- Noticeably reduced fetal movement
When to Go Directly to the Emergency Room
Some situations require immediate emergency care — not a phone call, not a message through the patient portal:
- Blood pressure of 160/110 or higher
- A seizure or convulsion
- Sudden severe headache with stiff neck or confusion
- Chest pain or serious difficulty breathing
- Signs of stroke: facial drooping, one arm weaker than the other, slurred speech
Call 911 or have someone drive you. Do not drive yourself to the hospital when blood pressure is this high.
HELLP Syndrome: The Serious Complication
HELLP syndrome is a severe variant of preeclampsia. The name stands for Hemolysis (red blood cell destruction), Elevated Liver enzymes, and Low Platelet count. It's dangerous because it impairs the blood's ability to clot and can cause liver damage.
The tricky part: HELLP symptoms are easy to confuse with other things. Upper right abdominal pain, nausea, and fatigue are common complaints in late pregnancy. What sets HELLP apart is the lab work — blood tests showing low platelets and elevated liver enzymes. Some women with HELLP don't even have severely elevated blood pressure, which is why HELLP is sometimes diagnosed without an obvious "preeclampsia presentation."
If you have persistent upper right abdominal or shoulder pain, especially in the third trimester, go to the hospital. Don't troubleshoot this at home.
How Preeclampsia Is Managed
Management depends on severity and how far along the pregnancy is:
- Mild preeclampsia before 37 weeks: Close outpatient monitoring — blood pressure checks several times per week, urine tests, blood work, fetal growth ultrasounds. Modified activity or rest is usually recommended.
- Severe blood pressure (160/110 or higher): Blood pressure medication is required. Commonly used options in pregnancy include labetalol, nifedipine, and methyldopa — all of which have strong safety records in pregnancy.
- Hospitalization: For severe features, women are admitted and given magnesium sulfate intravenously to prevent seizures. Magnesium causes flushing and warmth — this is normal.
- Delivery: After 37 weeks, delivery is recommended even for mild preeclampsia. For severe features before 34 weeks, specialists weigh the risks of prematurity against maternal risk. Delivery is typically within 24–48 hours of severe features developing at any gestational age.
After Delivery: It's Not Over Yet
Blood pressure can remain elevated — or get worse — after delivery. The first 6 days postpartum are particularly high-risk. Go home with a blood pressure cuff, check it daily, and know your numbers. Blood pressure of 140/90 after discharge means call your provider immediately. Blood pressure of 160/110 means go to the ER.
Postpartum preeclampsia can develop even in women who never had it during pregnancy. Don't assume the danger passed because the baby arrived.
Track Your Blood Pressure at Home
If you have been diagnosed with gestational hypertension, preeclampsia, or have significant risk factors, home blood pressure monitoring is strongly recommended. An upper-arm cuff monitor is more reliable than a wrist monitor for pregnancy use.
Upper-Arm Blood Pressure Monitors for Pregnancy Monitoring
Upper-arm cuffs are more accurate than wrist monitors during pregnancy. Look for clinically validated models with large-cuff options (important if arm circumference increases), memory storage, and Bluetooth sync to track trends over time. Validated models recommended by healthcare providers include Omron and Withings.
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The Long-Term Picture
Having preeclampsia once raises the risk of having it again in future pregnancies (roughly 15–25% recurrence risk). It also leaves a lasting mark on cardiovascular health: women who have had preeclampsia are about twice as likely to develop heart disease and stroke over their lifetime compared to women who haven't.
This is not meant to be alarming — it's meant to be actionable. Tell every future healthcare provider that you had preeclampsia. Have your blood pressure, cholesterol, and blood sugar checked at annual physicals. A heart-healthy lifestyle matters more for you than for the average person. Your medical history doesn't have to define your future, but it does need to inform it.