Signs of Pre-eclampsia: What to Actually Watch For

Pre-eclampsia is a pregnancy condition involving high blood pressure and, usually, protein in the urine, typically developing after 20 weeks. It's relatively common in mild forms and picked up routinely through your regular antenatal checks — which is exactly why those checks (blood pressure and urine tests at every appointment) matter, even when they feel routine and quick.

Why routine antenatal checks catch most cases

Blood pressure and urine protein are checked at every antenatal appointment specifically because pre-eclampsia often develops without symptoms in its early stages. This is the main reason not to skip or delay routine appointments, even if you feel completely well — the check itself is often how it's caught before symptoms appear.

Symptoms to act on immediately

Contact your midwife, maternity unit, or GP straight away — the same day, not "next appointment" — if you notice:

• A severe headache that doesn't go away with paracetamol
• Vision problems — blurring, flashing lights, or seeing spots
• Pain just below the ribs, particularly on the right side
• Vomiting, in combination with any of the above
• Sudden swelling of the face, hands, or feet (some swelling in pregnancy is normal; sudden, significant swelling is the concerning pattern)
• Feeling generally very unwell

Who's at higher risk

Certain factors raise the likelihood: a first pregnancy, a previous pregnancy with pre-eclampsia, a family history of it, being over 40, a BMI over 35, a multiple pregnancy (twins or more), or pre-existing conditions like high blood pressure, diabetes, or kidney disease. If you have significant risk factors, you may be offered low-dose aspirin from early pregnancy, which has good evidence for reducing risk.

What happens if you're diagnosed

Mild pre-eclampsia is usually managed with more frequent monitoring — blood pressure checks, blood tests, and sometimes medication to control blood pressure. More severe cases may need hospital admission for closer monitoring, and in some cases early induction of labour or caesarean birth, since delivering the baby is currently the only way to fully resolve pre-eclampsia. The decision on timing balances the risks of prematurity against the risks of the condition itself, made individually with your care team.

The reassuring context

Most cases caught through routine screening are managed successfully with monitoring and, if needed, medication, without it becoming an emergency. Serious complications are rare specifically because the condition is actively screened for at every appointment — the system is built around catching it early, which is why those blood pressure cuffs and urine sample pots at every visit matter more than they might seem to.