Pregnancy
Pre-eclampsia: patient guide
Pre-eclampsia is a pregnancy complication defined by new high blood pressure with signs of organ involvement, usually after 20 weeks. It can escalate quickly and needs monitoring; delivery is the cure, and timing it well is the art.
Key points
The essentials at a glance.
What to look out for, who treats it, and what usually happens next.
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Warning symptoms: severe headache, visual disturbance (flashing lights or blurring), pain below the ribs, sudden swelling of face, hands or feet, and reduced fetal movements — seek same-day review
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Many women have no symptoms; that is why blood pressure and urine are checked at every antenatal visit
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Risk factors include first pregnancy, previous pre-eclampsia, chronic hypertension, diabetes, kidney disease, twins, BMI over 35 and age over 40
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Women at increased risk are advised low-dose aspirin from 12 weeks, which reduces the chance of developing it
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Treatment involves blood pressure control, blood monitoring and planning the safest time for birth
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Blood pressure can rise after delivery too; postnatal monitoring matters
Understanding it
About Pre-eclampsia: patient guide.
Pre-eclampsia begins with the placenta: imperfect early implantation releases factors into the mother's circulation that injure blood vessel linings, raising blood pressure and affecting the kidneys, liver, brain and clotting system, while sometimes restricting the baby's growth. It affects up to 1 in 20 pregnancies in some form and ranges from mild and late to severe and early.
Care centres on surveillance, blood pressure, urine protein, blood tests such as PlGF, and fetal growth scans, with antihypertensives to keep pressure safe and magnesium sulphate to prevent seizures in severe disease. Because delivery is the only cure, specialists weigh the baby's maturity against maternal risk to choose the moment, and aspirin prophylaxis in the next pregnancy cuts recurrence. In the UK you can start with your GP: on the NHS, a routine referral to a specialist clinic often means waiting 20–45 weeks or more to be seen, while a private consultant will typically see you within around two weeks, with any tests arranged soon after.
Frequently asked
Common questions about Pre-eclampsia: patient guide.
Quick, plain-English answers to what people ask us most.
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What is pre-eclampsia?
Pre-eclampsia is a pregnancy condition characterised by high blood pressure and protein in the urine, usually developing after 20 weeks of pregnancy, which can affect both mother and baby if not properly monitored and treated.
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What causes pre-eclampsia?
The exact cause isn't fully understood, but it's thought to involve problems with how the placenta develops and functions, leading to widespread effects on the mother's blood vessels and organs.
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What are the symptoms of pre-eclampsia?
High blood pressure and protein in the urine are the key features, sometimes with symptoms such as severe headache, visual disturbance, upper abdominal pain, and swelling of the hands, face, or feet, though many women initially have no noticeable symptoms.
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Is pre-eclampsia dangerous?
Yes, it can be serious for both mother and baby if not properly managed, potentially progressing to more severe complications, which is why regular blood pressure and urine checks throughout pregnancy are so important.
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Can pre-eclampsia be prevented?
For women at higher risk, low-dose aspirin started early in pregnancy has been shown to reduce the risk of developing pre-eclampsia, alongside regular antenatal monitoring to catch it early if it does develop.
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How is pre-eclampsia treated?
Treatment includes closer monitoring, blood pressure-lowering medication, and, ultimately, timing of delivery to balance the risks of prematurity against the risks of continuing the pregnancy, with delivery being the definitive treatment.
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How long does pre-eclampsia take to resolve after delivery?
Blood pressure typically starts to improve within days to weeks after delivery, though it can occasionally take longer to fully normalise, and close monitoring continues during this recovery period.
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Pre-eclampsia vs gestational hypertension — what's the difference?
Gestational hypertension is high blood pressure developing in pregnancy without protein in the urine or other pre-eclampsia features, while pre-eclampsia specifically includes protein in the urine and, potentially, effects on other organs; both need close monitoring, but pre-eclampsia carries additional risks.
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Will pre-eclampsia happen again in future pregnancies?
There's an increased risk of recurrence in future pregnancies if you've had pre-eclampsia before, so preventive measures such as aspirin and closer monitoring are typically recommended for subsequent pregnancies.
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When is this an emergency, and how quickly should I be seen otherwise?
Severe headache, visual disturbance, or upper abdominal pain in pregnancy needs urgent same-day assessment, and severe symptoms warrant immediate hospital attendance. For routine monitoring, your antenatal team provides regular checks throughout pregnancy as part of standard care.