PanicStation.org
UK USA
uk Health & medical scares sudden severe headache pregnant • vision changes in pregnancy • blurred vision while pregnant • flashing lights pregnancy • seeing spots pregnancy • worst headache of my life pregnant • thunderclap headache pregnancy • headache that wont go away pregnant • migraine vs preeclampsia pregnancy • possible pre-eclampsia symptoms • high blood pressure pregnancy signs • late pregnancy headache • severe headache after 20 weeks • dizzy with headache pregnancy • headache and swelling pregnancy • headache and upper belly pain pregnancy • headache with vomiting pregnancy • sudden vision loss pregnancy • maternity triage headache

What to do if…
you are pregnant and you notice a sudden severe headache or vision changes

Short answer

Treat this as urgent. Call your maternity unit (maternity triage/maternity assessment), your midwife, your GP, or NHS 111 now, and call 999 if symptoms are severe or you feel unsafe.

Do not do these things

  • Do not “wait and see” or sleep it off if the headache is sudden, severe, or comes with vision changes.
  • Do not drive yourself if you have blurred vision, dizziness, faintness, confusion, or feel unwell.
  • Do not keep taking extra painkillers beyond the label dose, or start new medicines (including leftover prescriptions) to “knock it out”.
  • Do not assume it’s “just migraine” if this feels different from your usual headaches.
  • Do not downplay it when you call—say clearly: “I’m pregnant and I have a sudden severe headache and/or vision changes.”

What to do now

  1. If any “red flag” is happening, call 999 now. Examples: you cannot see properly, you faint, you have a seizure, you have weakness/numbness on one side, facial droop, trouble speaking, severe confusion, severe breathlessness, or this is the “worst sudden headache” you’ve ever had.
  2. Otherwise, contact urgent maternity care immediately. Call your maternity triage / maternity assessment unit / maternity unit (often 24/7). If you don’t have the number or can’t get through quickly, call NHS 111 and say you’re pregnant with these symptoms so they route you urgently. If you’re getting worse or you feel unsafe to travel, call 999.
  3. Use clear words that trigger the right response. When you speak to someone, say:
    • how many weeks pregnant you are
    • when it started and whether it came on suddenly
    • what the vision change is (blurred, flashing lights, spots, partial loss)
    • any other symptoms (pain just below your ribs/upper abdomen, vomiting, sudden swelling of face/hands/feet, feeling very unwell)
    • any history of high blood pressure or pre-eclampsia
  4. If you have a home blood pressure monitor, take one reading—but don’t delay the call to do it. Write down the number and the time. Tell the clinician the reading.
  5. Get yourself safer while you wait for advice or transport. Sit or lie on your side, dim bright lights if they worsen symptoms, and ask someone to stay with you. If you’re alone, call a friend/relative or neighbour to come over while you wait.
  6. Prepare to be assessed today. Gather your maternity notes, list of medications/supplements, any home BP readings, and your phone/charger. If you have childcare needs, do a quick “minimum plan” (one call/text) but keep the focus on getting seen.

What can wait

  • You do not need to figure out the cause yourself (migraine, stress, dehydration, etc.) before getting help.
  • You do not need to finish work, do chores, or keep appointments—this check comes first.
  • You do not need to decide now about tests, treatment options, or whether you’ll be admitted—those decisions come after assessment.

Important reassurance

Feeling scared is normal—sudden headache or vision changes in pregnancy are exactly the kind of symptoms professionals want you to report quickly. Getting checked promptly is the safest step for you and your baby, even if it turns out to be something treatable and not serious.

Scope note

This is first-steps-only guidance to get you assessed safely and quickly. Follow the instructions you’re given by maternity triage/111/999, and ask them to repeat anything you didn’t catch.

Important note

This is general information, not a diagnosis. Sudden severe headache or vision changes in pregnancy can be urgent and needs same-day professional assessment—use your maternity unit/midwife, NHS 111, or 999 depending on severity.

Additional Resources
Support us