Aches & Pains
Headaches in Pregnancy
A common pregnancy symptom, usually harmless, but some patterns — especially with vision changes or swelling — need urgent checking for pre-eclampsia.
Written and fact-checked by the ParentVibes editorial team against WHO, NHS, ACOG and peer-reviewed guidance. Not yet reviewed by a named clinician.
Quick facts
- Most common when
- 1st trimester and later 3rd trimester
- Usual cause
- Hormones, tiredness, dehydration, tension
- Usually eases with
- Rest, fluids, and doctor-approved pain relief
- Watch for
- Severe headache with vision changes or swelling
- Possible serious cause
- Pre-eclampsia (2nd half of pregnancy)
A headache can feel like just another everyday niggle, and most of the time in pregnancy, that's exactly what it is — hormones, tiredness and dehydration are common, harmless triggers. But because headaches can occasionally be an early sign of a pregnancy-specific condition called pre-eclampsia, it's worth knowing which patterns are reassuring and which need same-day medical attention.
This guide covers why headaches happen at different stages of pregnancy, safe ways to ease them, and the specific warning signs — especially in the second half of pregnancy — that mean you should get your blood pressure and urine checked without delay.
What causes headaches in pregnancy?
Headaches are one of the most common symptoms of pregnancy and can occur at any stage. In the first trimester, they're often linked to the rapid rise in hormones, along with changes in blood volume and blood sugar. Tiredness, disturbed sleep, dehydration, and even caffeine withdrawal if you've cut back can all play a part.
Later in pregnancy, headaches are more often related to poor posture, tension in the neck and shoulders as your bump grows, tiredness, or stress. Most headaches throughout pregnancy are the ordinary 'tension-type' headache — a dull, band-like ache — and settle with rest and simple self-care. A smaller number of people have migraines, which may improve or worsen in pregnancy depending on the person.
Second half of pregnancy needs extra attention
A new, severe or persistent headache from around 20 weeks onwards — especially with visual disturbance, swelling or upper tummy pain — should always be checked promptly for pre-eclampsia, even if you feel it's 'probably nothing'.
What causes headaches in pregnancy?
Most headaches in pregnancy have an everyday, non-serious cause.
Hormonal changes
Rising and fluctuating hormone levels, particularly in the first trimester, are a common trigger for headaches.
Dehydration and low blood sugar
Not drinking enough, or going too long between meals, can bring on a headache quite quickly.
Tiredness and poor sleep
Disturbed sleep, made worse by a growing bump or frequent trips to the bathroom, is a common contributor.
Tension and posture
Neck and shoulder tension increases as your posture shifts to accommodate your growing bump, especially later in pregnancy.
Stress and eyestrain
Everyday stress, screen time and eyestrain can all trigger tension-type headaches, just as outside pregnancy.
Caffeine withdrawal
Cutting down on caffeine suddenly in early pregnancy can cause a temporary withdrawal headache.
Migraine can change in pregnancy
If you already get migraines, they may become less frequent in pregnancy for some people, though others find they continue or worsen — mention any change in pattern to your midwife.
When headaches are normal
Most headaches in pregnancy are ordinary and not a cause for concern when they look like this:
- A mild-to-moderate, dull or band-like ache that responds to rest, fluids and paracetamol as advised by your doctor or midwife.
- A headache linked to an obvious trigger, such as tiredness, hunger or a long day at a screen.
- No visual changes, swelling or tummy pain alongside it.
- Headaches that come and go rather than becoming constant or steadily worsening.
| Usually a typical headache | Needs urgent medical attention | |
|---|---|---|
| Severity | Mild to moderate, manageable | Severe, described as 'the worst ever' |
| Vision | Normal | Blurring, flashing lights, spots |
| Other symptoms | None | Swelling of face/hands/feet, upper tummy pain, vomiting |
| Response to rest | Improves with rest, fluids, simple pain relief | Doesn't improve, or keeps returning |
Always check pain relief with your doctor or midwife first
Don't take anything for a headache — even something you'd normally use — without checking it's suitable in pregnancy.
Warning signs — get medical help now
Contact your doctor or midwife urgently, or go to your nearest emergency department, if you have a headache with any of the following, particularly from the second half of pregnancy onwards:
Seek urgent medical care if you have
- A severe headache that doesn't ease with rest or simple pain relief.
- Vision changes: blurring, flashing lights, spots, or temporary loss of vision.
- Swelling of your face, hands or feet that comes on suddenly or gets rapidly worse.
- Pain just below your ribs, particularly on the right side, or vomiting.
- A sudden, extremely severe 'thunderclap' headache unlike any you've had before.
- A headache with fever and a stiff neck.
- A headache following a head injury or fall.
If you also notice reduced or absent baby movements alongside a headache, contact your maternity unit the same day.
Headache with vision changes needs same-day checks
This combination, especially in the second half of pregnancy, can be an early sign of pre-eclampsia. You need your blood pressure and urine checked promptly — don't wait it out at home.
Self-care & relief for headaches
For ordinary, non-emergency headaches, these measures help most people.
Rest and hydrate
- Lie down in a quiet, dark room for 30 minutes if you can.
- Drink water regularly through the day — dehydration is a common trigger.
- Eat regularly to avoid your blood sugar dropping.
Ease tension
- Gently massage your neck, shoulders and temples.
- Apply a cool flannel to your forehead or a warm one to your neck and shoulders.
- Practise relaxation techniques such as slow breathing or gentle stretching.
Manage triggers
- Keep a simple diary of when headaches happen to spot patterns.
- Reduce screen time and take regular breaks if you work at a computer.
- Get outside for fresh air and gentle movement where you can.
Ask before taking anything
Paracetamol is generally considered suitable in pregnancy when needed, but always check the type, dose and frequency with your doctor, midwife or pharmacist first, and avoid anti-inflammatory painkillers unless specifically advised.
When to consult a doctor
Book a prompt appointment (not necessarily an emergency, but sooner rather than later) if:
- Headaches are becoming more frequent or more severe as pregnancy progresses.
- You have a history of migraines and they've changed in pattern or intensity.
- Simple self-care isn't helping and you need advice on safe pain relief.
- You're worried, even if you can't put your finger on exactly why.
Track your symptoms and blood pressure
Logging your headaches alongside other symptoms helps your midwife spot patterns early — particularly useful in the second half of pregnancy.
Open the Pregnancy TrackerFrequently asked questions
Are headaches normal in early pregnancy?
Yes, headaches are common in the first trimester, often linked to rising hormones, tiredness, dehydration or cutting down on caffeine. They're usually mild and settle with rest and fluids.
Can I take paracetamol for a headache in pregnancy?
Paracetamol is generally considered suitable in pregnancy when needed, but always check the correct dose and frequency with your doctor, midwife or pharmacist, and avoid anti-inflammatory medicines unless specifically advised.
What is the link between headaches and pre-eclampsia?
A severe or persistent headache in the second half of pregnancy, especially with vision changes, swelling or upper tummy pain, can be an early sign of pre-eclampsia, a condition affecting blood pressure that needs prompt monitoring and treatment.
Why have my migraines changed since I got pregnant?
Hormonal changes affect migraine differently for different people — some notice fewer attacks, especially after the first trimester, while others find they continue or occasionally worsen. Mention any change to your midwife.
When is a headache a pregnancy emergency?
Seek urgent care for a severe headache with visual disturbance, sudden swelling, upper tummy pain, vomiting, a 'thunderclap' onset, or a headache with fever and neck stiffness. These need prompt assessment.
What helps prevent headaches in pregnancy?
Staying hydrated, eating regularly, getting enough rest, managing stress and taking breaks from screens all help reduce how often headaches occur for many people.
Your next steps
Track your pregnancy
Log symptoms week by week, get personalised tips, and see how your pregnancy is progressing.
Open Pregnancy TrackerPregnancy week-by-week
Follow your baby's growth and your body's changes from week 1 to 40 in plain language.
Explore the guideFind a gynaecologist
Have a personal concern? Book with a trusted obstetrician or gynaecologist near you.
Find a doctorRelated pregnancy symptoms
Helpful resources
Sources
- NHS — Pregnancy: common symptoms & concerns
- ACOG — Pregnancy resources (American College of Obstetricians and Gynecologists)
- WHO — Maternal health & pregnancy care
- NHS — Pre-eclampsia
- NHS — Headaches in pregnancy
Next review due: 6 January 2027.
Medical disclaimer
This page is general information about a common pregnancy symptom and does not replace personal medical advice. Every pregnancy is different. If you have severe pain, heavy bleeding, a bad headache with vision changes, reduced or absent baby movements, breathing difficulty, fever, or you feel something is seriously wrong, contact your doctor or midwife or go to your nearest emergency department straight away. When in doubt, always get checked — it is never a waste of anyone's time.
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