🤰 Pregnancy

Blood Pressure During Pregnancy — Normal Ranges and Warning Signs (2026)

Normal blood pressure in pregnancy, gestational hypertension, and preeclampsia warning signs. When to seek urgent help. Updated January 2026.

📅 Updated January 2026⏱ 7 min read👤 Dr. Sarah Mitchell, MD✓ Medically Reviewed

Key Takeaways

Blood pressure normally drops in first and second trimester
Preeclampsia affects 2–8% of pregnancies and is a leading cause of maternal mortality
BP above 140/90 in pregnancy requires same-day medical evaluation
Preeclampsia symptoms: headache, visual changes, upper abdominal pain, sudden swelling
Low-dose aspirin from 12 weeks reduces preterm preeclampsia by 62% in high-risk women

In This Article

How Blood Pressure Changes in Pregnancy

Blood volume increases 40–50% during pregnancy, and peripheral vascular resistance decreases due to hormonal effects. The result: blood pressure normally drops in the first and second trimester, reaching its lowest around 20–24 weeks, before gradually rising toward pre-pregnancy levels in the third trimester.

2–8%

of pregnancies affected by preeclampsia

140/90

BP requiring same-day medical evaluation

62%

Reduction in preterm preeclampsia with aspirin

Types of Hypertension in Pregnancy

Chronic hypertension: Pre-existing BP above 140/90 before 20 weeks
Gestational hypertension: BP above 140/90 after 20 weeks, no other features
Preeclampsia: Gestational hypertension + proteinuria or organ involvement
HELLP syndrome: Severe variant — haemolysis, elevated liver enzymes, low platelets — medical emergency

Preeclampsia Warning Signs

🚨 Seek Emergency Help Immediately For:

Severe headache not relieved by paracetamol · Vision changes (flashing lights, blurring) · Severe upper abdominal or right-sided pain · Sudden severe swelling of face/hands · Difficulty breathing · BP above 160/110 at home · Any BP above 140/90 + any of the above. UK: call 999 or go to maternity triage. USA/Canada: call 911 or go to emergency.

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Frequently Asked Questions

What is normal blood pressure in pregnancy?▼

Normal is below 130/80 mmHg. Most women experience a physiological drop of 10–15 mmHg in first and second trimester before returning to normal in third trimester. At or above 140/90 on two occasions requires medical evaluation.

What is the difference between gestational hypertension and preeclampsia?▼

Gestational hypertension: high BP (140/90+) after 20 weeks without other features. Preeclampsia: gestational hypertension PLUS proteinuria or organ involvement (kidney, liver, platelets). Preeclampsia carries significantly higher maternal and fetal risk.

Can preeclampsia be prevented?▼

In high-risk women, low-dose aspirin (75–150mg from 12 weeks to 36 weeks) reduces preterm preeclampsia by approximately 62% (ASPRE trial). Risk factors: previous preeclampsia, multiple pregnancy, BMI above 35, age 40+, pre-existing hypertension or diabetes.

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⚕️ Medical Disclaimer: For informational purposes only. Not a substitute for professional medical advice. Always consult a qualified healthcare professional.

Dr. Sarah Mitchell, MD

WellCalc Medical Contributor

All WellCalc articles are reviewed by qualified healthcare professionals following NHS, AHA, and WHO guidelines.