Pregnancy

Preeclampsia Risk: Who's Watched More Closely

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Preeclampsia risk is highest with a first pregnancy, twins, chronic high blood pressure, diabetes, kidney or autoimmune disease, or preeclampsia in an earlier pregnancy. Obesity, a family history, and age under 20 or over 35 add to it. Those at high risk are often offered low-dose aspirin from early in the second trimester.

Last updated: July 2026

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What actually raises your risk for preeclampsia?

Risk factors fall into two tiers that clinicians weigh differently when deciding who needs extra prevention 1. High-risk factors include a prior pregnancy with preeclampsia, chronic hypertension, type 1 or type 2 diabetes, kidney disease, autoimmune conditions such as lupus, and carrying more than one baby 1.

Moderate-risk factors include a first pregnancy, a body mass index above 30, a mother or sister who had preeclampsia, age 35 or older, and a pregnancy conceived through IVF 1. According to ACOG, a single high-risk factor, or two or more moderate ones, is enough to recommend preventive aspirin. Preeclampsia complicates roughly 1 in 25 pregnancies overall, and the rate climbs steeply as these factors stack, so having several moderate factors together can matter as much as one high-risk factor alone 2.

Why does a first pregnancy carry more risk?

First pregnancies account for a large share of preeclampsia cases, and the reason is thought to lie in how the placenta and maternal blood vessels adapt the first time 2. A new partner, a long gap between pregnancies, or a pregnancy from donor eggs can reset some of that risk back toward first-pregnancy levels 2.

Chronic high blood pressure that predates pregnancy is a separate and powerful driver, and it is one of the high-risk factors that prompts preventive aspirin 1. If you already track your pressure, knowing what a reading of 140/90 means helps you flag a change early. Preeclampsia also overlaps with gestational diabetes, and the two share risk factors such as higher body weight.

Who is offered low-dose aspirin, and how much does it help?

Low-dose aspirin is the one well-proven medication for lowering preeclampsia risk in people flagged as high risk 1. According to ACOG, it is generally started between 12 and 28 weeks, ideally before 16 weeks, and continued until delivery 1.

In the ASPRE trial of high-risk pregnancies, aspirin cut preterm preeclampsia by roughly 60 percent 3. A broader Cochrane review of antiplatelet agents found a smaller but real reduction of about 18 percent across all risk levels 4. Aspirin does not replace monitoring, and the decision to start it belongs to your prenatal provider rather than a general checklist. Even with prevention, some pregnancies still develop preeclampsia, so watchfulness continues either way.

Does your age or history change the picture?

Age sits at both ends of the risk curve, with teenagers and people over 35 carrying more risk than those in their twenties 2. A prior hypertensive pregnancy is one of the strongest predictors that it will happen again, though many people go on to have a normal second pregnancy 2.

According to the American Heart Association, preeclampsia also signals higher long-term risk of heart disease and stroke, so the history stays relevant long after delivery 5. The condition can even appear for the first time in the days after birth. Reviewing your swelling and other early symptoms with a provider helps sort ordinary pregnancy changes from warning signs.

When preeclampsia risk changes your prenatal plan

A high-risk profile usually means more frequent visits, earlier aspirin, extra growth scans, and closer blood pressure tracking than a low-risk pregnancy 1. Knowing your risk category also tells you which symptoms deserve a same-day call, such as a severe headache, vision changes, or sudden swelling, rather than a wait-and-see approach.

Reading about preeclampsia symptoms alongside your risk factors gives a fuller picture. Gale can help you build a short list of your risk factors to bring to a prenatal visit. A prenatal provider or maternal-fetal medicine specialist is the right person to set your monitoring plan and decide whether aspirin fits your history.

Common questions

Clinicians add up your risk factors. One high-risk factor, such as chronic hypertension, diabetes, kidney disease, twins, or a prior preeclampsia, usually qualifies you, as does having two or more moderate factors like a first pregnancy, obesity, or age over 35. Your prenatal provider makes the call.

A prior case is one of the strongest predictors, but a repeat is not guaranteed. Many people go on to have a normal next pregnancy. A history of preeclampsia usually means earlier aspirin, closer monitoring, and a lower threshold to check blood pressure and labs.

Age over 35 counts as a moderate risk factor rather than an automatic high-risk label. On its own it may not change much, but combined with a first pregnancy, higher body weight, or a family history, it can be enough to recommend aspirin and closer follow-up.

Some measures help modestly, and entering pregnancy with well-controlled blood pressure and blood sugar matters. Aspirin is the intervention with the strongest evidence for high-risk pregnancies. There is no diet that reliably prevents preeclampsia, so monitoring remains central.

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Preeclampsia warning signs if you are higher risk

  • —A severe or persistent headache, vision changes, or a sharp rise in blood pressure is a reason to seek same-day obstetric review
  • —Upper-abdominal or right-sided rib pain with nausea is a reason to contact your prenatal provider promptly
  • —Sudden swelling of the face and hands or rapid weight gain over a few days is a reason to have your blood pressure and urine checked
  • —Fewer of the baby's usual movements is a reason to be evaluated the same day
  • —A seizure, fainting, or severe shortness of breath is a reason to call 911 or go to the nearest emergency room

If you have a seizure, faint, have severe shortness of breath, or a severe headache with vision changes and very high blood pressure, call 911 or go to the nearest emergency room. For new but non-severe warning signs, contact your prenatal provider the same day.

This article is general health education, not medical advice. Whether your risk factors call for aspirin or closer monitoring is a decision for a prenatal provider or maternal-fetal medicine specialist who knows your history.

References

  1. 1.American College of Obstetricians and Gynecologists (2018). ACOG Committee Opinion No. 743: Low-Dose Aspirin Use During Pregnancy. Obstetrics & Gynecology. doi:10.1097/AOG.0000000000002708 ✓Lists high-risk and moderate-risk factors for preeclampsia, the one-high-or-two-moderate rule for recommending aspirin, and aspirin timing from 12 to 28 weeks, ideally before 16 weeks, continued to delivery
  2. 2.American College of Obstetricians and Gynecologists (2020). Gestational Hypertension and Preeclampsia: ACOG Practice Bulletin, Number 222. Obstetrics & Gynecology. doi:10.1097/AOG.0000000000003891 ✓Supports overall preeclampsia incidence, first-pregnancy and placental mechanism, prior hypertensive pregnancy as a strong predictor, and risk at extremes of maternal age
  3. 3.Rolnik DL, Wright D, Poon LC, et al. (2017). Aspirin versus placebo in pregnancies at high risk for preterm preeclampsia. New England Journal of Medicine. doi:10.1056/NEJMoa1704559 ✓The ASPRE randomized trial found low-dose aspirin reduced preterm preeclampsia by roughly 60 percent in high-risk pregnancies
  4. 4.Duley L, Meher S, Hunter KE, Seidler AL, Askie LM (2019). Antiplatelet agents for preventing pre-eclampsia and its complications. Cochrane Database of Systematic Reviews. doi:10.1002/14651858.CD004659.pub3 ✓Cochrane review of antiplatelet agents found about an 18 percent reduction in preeclampsia across risk levels
  5. 5.Parikh NI, et al. (American Heart Association) (2021). Adverse Pregnancy Outcomes and Cardiovascular Disease Risk: Unique Opportunities for Cardiovascular Disease Prevention in Women: A Scientific Statement From the American Heart Association. Circulation. doi:10.1161/CIR.0000000000000961 ✓Preeclampsia signals elevated long-term cardiovascular disease and stroke risk, so the history remains clinically relevant after delivery

5 sources, numbered by first appearance. General health information, not medical advice. AI-assisted editorial content — every citation independently verified. Editorial policy

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