Pregnancy

Pregnancy Headaches: Common vs Call-Now

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Most pregnancy headaches are tension-type or hormonal and ease with rest, hydration, and clinician-approved acetaminophen. A new or severe headache after 20 weeks, particularly with blurred vision, swelling, or upper-belly pain, can signal preeclampsia and is a reason to call the same day rather than wait.

Last updated: July 2026

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What causes most headaches during pregnancy?

Most headaches in pregnancy are ordinary tension headaches or hormone-related ones. Rising and shifting hormones, dehydration, poor sleep, low blood sugar, caffeine changes, and stress all play a part, especially in the first trimester 1.

These headaches usually feel like a dull, pressing band around the head rather than a thunderclap, and they tend to ease with rest, fluids, regular meals, and clinician-approved acetaminophen 1. Migraine often improves in the second and third trimesters as estrogen levels stabilize, and many people notice their headache pattern shifts again after menopause. Learning which medicines are safe in pregnancy can take some worry out of treating a routine headache.

When does a pregnancy headache mean I should call?

A new, severe, or persistent headache in the second half of pregnancy is the pattern that deserves a call. After 20 weeks, a headache that does not ease with acetaminophen, particularly one paired with blurred or flashing vision, pain under the ribs, nausea, or sudden swelling of the face and hands, can be a sign of preeclampsia 2.

According to ACOG, these features, especially with a blood pressure of 140/90 or higher, warrant prompt evaluation the same day 2. A headache that wakes you from sleep, is the worst you have ever had, or comes with fever and a stiff neck also needs urgent review. Reviewing preeclampsia symptoms helps you recognize the combination early.

How is preeclampsia connected to headaches?

Preeclampsia is a blood-pressure disorder of pregnancy that can announce itself with headaches. It usually appears after 20 weeks and involves high blood pressure plus signs that organs are under strain, such as protein in the urine 3.

The headache of preeclampsia is often described as severe and persistent, and it may not respond to usual pain relief. Because blood pressure can climb without obvious symptoms, guidelines emphasize regular prenatal blood-pressure checks 3. For those at higher risk, clinicians sometimes recommend low-dose aspirin from early pregnancy to lower the chance of preeclampsia 4, and knowing how often to check your blood pressure can help you and your team catch changes.

What can safely ease a headache while pregnant?

Simple measures relieve most pregnancy headaches without any medication at all. Drinking water, eating regularly, resting in a dark quiet room, gentle neck stretches, a cool compress, and steady sleep address the common triggers 1.

Acetaminophen is generally considered the preferred pain reliever in pregnancy when something more is needed, while nonsteroidal drugs like ibuprofen are usually avoided, especially later on, and a clinician can confirm what fits your situation 1. If headaches are frequent, or you have a history of frequent headaches or migraine, it is worth discussing a plan rather than treating each one alone. Tracking timing and triggers gives your clinician useful detail.

When a pregnancy headache needs a call

Certain headache patterns are always worth a prompt conversation with your maternity team. A severe headache after 20 weeks, any headache with vision changes, upper-abdominal pain, or swelling, a sudden worst-ever headache, or one with fever and a stiff neck should prompt same-day contact rather than waiting.

When in doubt, calling is reasonable, because clinicians would far rather check a blood pressure and reassure you than miss preeclampsia. A midwife, obstetrician, or primary care clinician can sort a routine headache from one that needs testing. Gale can help you note your symptoms and blood-pressure readings before you call.

Common questions

Yes, they are common. Hormonal shifts, dehydration, fatigue, hunger, and cutting back on caffeine often trigger tension-type headaches in the first trimester. Most ease with rest, fluids, regular meals, and clinician-approved acetaminophen, and many people find they lessen as pregnancy continues.

Acetaminophen is generally considered the preferred option in pregnancy, while ibuprofen and other nonsteroidal drugs are usually avoided, particularly in the third trimester. Because individual situations differ, it is worth confirming with your clinician or pharmacist what is appropriate for you.

Preeclampsia headaches typically appear after 20 weeks, are severe or persistent, and may not respond to usual pain relief. Warning signs include blurred or flashing vision, pain under the ribs, sudden swelling, and high blood pressure. That combination is a reason to call the same day.

A severe headache after 20 weeks with vision changes, upper-belly pain, or swelling, a sudden worst-ever headache, or one with fever and neck stiffness should be assessed urgently. When symptoms are milder, calling your maternity team first is usually the right starting point.

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Pregnancy headaches: when to seek care now

  • —A severe or persistent headache after 20 weeks, especially with blurred vision or swelling, is a reason to seek same-day evaluation.
  • —A sudden, worst-ever thunderclap headache warrants emergency assessment.
  • —A headache with fever and a stiff neck is a reason to seek urgent medical care.
  • —A blood-pressure reading of 140/90 or higher with a headache is a reason to contact your maternity team right away.

If you have a sudden worst-ever headache, a severe headache with vision changes or swelling after 20 weeks, weakness or trouble speaking, or a seizure, call 911 or go to the nearest emergency room.

This article is general health education, not medical advice. A midwife, obstetrician, or primary care clinician should evaluate a headache that concerns you, particularly in the second half of pregnancy.

References

  1. 1.National Institute for Health and Care Excellence (2024). Antenatal care (NG201). National Institute for Health and Care Excellence (NICE). link ✓NICE antenatal care guidance on common pregnancy symptoms and their management, including tension-type headache, usual comfort measures, and paracetamol/acetaminophen as the usual analgesic in pregnancy.
  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 ✓ACOG practice bulletin defining preeclampsia and its warning signs after 20 weeks, including new or severe headache, visual changes, upper-abdominal pain, and blood pressure of 140/90 or higher warranting prompt evaluation.
  3. 3.National Institute for Health and Care Excellence (2023). Hypertension in pregnancy: diagnosis and management (NG133). National Institute for Health and Care Excellence (NICE). link ✓NICE guidance on hypertension in pregnancy, including that blood pressure can rise without symptoms and that regular antenatal blood-pressure monitoring is central to detecting preeclampsia.
  4. 4.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 ✓ACOG guidance that low-dose aspirin from early pregnancy is recommended for those at increased risk of preeclampsia.

4 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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