Preeclampsia is a pregnancy complication characterised by high blood pressure and often signs of damage to other organ systems, most commonly the liver and kidneys. For women pregnant after 35, understanding preeclampsia—its risk factors, warning signs, and the monitoring that can support early detection—is a valuable part of informed prenatal care. While the condition is more common in older first-time mothers, it is important to contextualise what that increased risk actually means in practical terms.
According to the American College of Obstetricians and Gynecologists (ACOG), preeclampsia affects approximately 5–8% of pregnancies overall. While age is one of several risk factors, the majority of pregnancies in women over 35 do not involve preeclampsia. Awareness of the condition and regular prenatal monitoring remain the most effective tools for early identification and management.
Risk Factors Associated With Preeclampsia
Preeclampsia has multiple associated risk factors, and age over 35 is one of several. Understanding the broader picture helps in assessing individual risk more accurately than focusing on any single factor in isolation.
Age and First Pregnancy
Research indicates that women over 40 have a higher risk of preeclampsia than younger women, and that first-time mothers (nulliparous women) at any age have elevated risk compared to those who have had previous pregnancies. For women over 35 who are pregnant for the first time, this combination of risk factors is worth discussing specifically with an OB/GYN to ensure appropriate monitoring is in place.
Pre-existing Health Conditions
Several pre-existing conditions are associated with elevated preeclampsia risk, including chronic hypertension, diabetes, kidney disease, autoimmune conditions such as lupus or antiphospholipid syndrome, and obesity. If any of these apply to your situation, your healthcare provider should be made aware so that monitoring can be appropriately tailored. For a broader overview of how pre-existing conditions interact with pregnancy after 35, our article on gestational diabetes after 35 addresses one such condition in more detail.
Multiple Pregnancy and Assisted Reproduction
Twin or higher-order pregnancies are associated with a significantly higher risk of preeclampsia. Since multiple pregnancies are more common in women who conceive through assisted reproductive technologies—which are more frequently used after 35—this is a relevant consideration for some women in this age group. Discussing multiple pregnancy risk and preeclampsia with your fertility or obstetric team before or early in a pregnancy can be helpful.
Warning Signs to Know
Preeclampsia can develop gradually or more suddenly, and some women experience minimal symptoms until the condition is already significant. This is one reason why regular prenatal blood pressure monitoring is so important. That said, certain symptoms may accompany or signal developing preeclampsia:
- Severe or persistent headaches
- Visual changes, including blurred vision, sensitivity to light, or seeing spots
- Upper abdominal pain, particularly under the right ribs
- Sudden swelling of the face, hands, or feet (note that some oedema is normal in pregnancy)
- Nausea or vomiting after mid-pregnancy
- Shortness of breath
Any of these symptoms should prompt prompt contact with your healthcare provider. Preeclampsia can progress quickly, and early assessment is always appropriate when these warning signs appear.
Monitoring and Prevention Considerations
For women at elevated risk, some research supports low-dose aspirin started in the first trimester as a preventive measure. ACOG guidelines indicate that low-dose aspirin may reduce the risk of preeclampsia in high-risk individuals when started between 12 and 28 weeks of gestation. Whether this is appropriate for you is a discussion to have with your OB/GYN based on your individual risk profile.
Regular prenatal visits that include blood pressure measurement, urine protein testing, and assessment of foetal growth are the cornerstone of preeclampsia monitoring. For women with additional risk factors, some providers may recommend increased visit frequency or additional monitoring tools such as uterine artery Doppler assessments in the second trimester. Your prenatal care plan should be tailored to your specific circumstances—a topic worth reviewing in the context of our overview of prenatal testing after 35.
Management and Delivery
Preeclampsia is managed differently depending on its severity and how far along a pregnancy is at diagnosis. Mild preeclampsia in a full-term pregnancy is typically managed through delivery, which is the only definitive resolution. At earlier gestations, management may involve hospitalisation, close monitoring, medications to control blood pressure, and steroids to support foetal lung development if early delivery appears likely.
The goal of management is to balance maternal health with foetal maturity. Healthcare providers use evidence-based protocols to guide these decisions, and individualised care plans are the standard. Understanding these general principles can help women engage more confidently in discussions with their care team when decisions about timing and mode of delivery arise.
Frequently Asked Questions
How much does age increase preeclampsia risk?
Research suggests age over 35–40 is associated with a modestly elevated risk of preeclampsia, particularly in first-time mothers or those with additional risk factors. However, the overall rate of preeclampsia even in older pregnant women remains relatively low, and many women in this age group complete their pregnancies without developing the condition. Your individual risk profile, including pre-existing conditions and pregnancy history, matters more than age alone.
Can preeclampsia be prevented?
There is no guaranteed way to prevent preeclampsia, but some research supports low-dose aspirin for women at high risk, when started early in pregnancy. Managing pre-existing conditions such as hypertension or diabetes before and during pregnancy may also be associated with lower risk. Discuss your specific situation with your OB/GYN to determine if any preventive measures are appropriate for you.
Does preeclampsia affect the baby?
Preeclampsia can affect placental function, potentially impacting foetal growth and oxygen delivery. It is one reason why foetal growth monitoring is part of standard care for women with or at risk for the condition. In severe cases or at early gestations, preterm delivery may be necessary, which carries its own neonatal considerations. Your healthcare team will monitor foetal wellbeing as part of preeclampsia management.
When does preeclampsia typically develop?
Preeclampsia most commonly develops after 20 weeks of pregnancy, often in the third trimester. However, a small proportion of cases—sometimes called early-onset preeclampsia—develop before 34 weeks and tend to be more severe. Postpartum preeclampsia, occurring after delivery, is also possible and worth being aware of. Symptoms developing after birth should be assessed promptly by a healthcare provider.
Key Takeaways
- Preeclampsia affects approximately 5–8% of pregnancies overall; while risk is modestly elevated after 35, most older pregnancies are not affected.
- Key risk factors include first pregnancy, pre-existing conditions (hypertension, diabetes), multiple pregnancy, and age—particularly over 40.
- Warning signs include persistent headaches, visual changes, upper abdominal pain, and sudden swelling—all warrant prompt contact with a healthcare provider.
- Low-dose aspirin may be recommended for high-risk women; discuss with your OB/GYN whether this is appropriate for your situation.
- Regular prenatal monitoring remains the most effective tool for early detection and management of preeclampsia.
Medical Disclaimer
This content is for informational purposes only and does not constitute medical advice. Individual health situations vary significantly. Always consult a qualified healthcare provider before making decisions related to your health, fertility, or pregnancy.
About the Author
Emily Carter is a women’s health writer focused on fertility, pregnancy after 35, and sleep changes in midlife. She writes research-informed, non-alarmist content to help women navigate reproductive and hormonal transitions with clarity and confidence.