Women's hormones
Migraines worse in your 40s? The perimenopause link, and what a blood test can honestly show
Reviewed by a qualified clinician · analysed at UKAS-accredited UK labs (ISO 15189)
Last reviewed August 20266 min read
Every Helvy guide is written by our health editors, then checked by a qualified clinician before it goes live and re-checked as the science moves. We name clinical roles, not individuals, until each reviewer has agreed to be credited publicly. This is wellness guidance to help you understand your own data, not a diagnosis.
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Migraine often gets worse in your forties because oestrogen swings rather than falls smoothly, and a sharp drop can set off an attack. No blood test measures that swing. FSH and LH can show where you sit in the transition, and thyroid, vitamin D and B12 rule out the common lookalikes.
Something changed. The attacks come more often, they last longer, and what used to shift them does not. You are in your forties and nobody has connected it to anything.
There is usually a reason. Here is what is happening, the one safety point to check today, and what bloods honestly add.
By the Helvy Medical Team · Reviewed by a qualified clinician · 6 min read
As of August 2026. Reflects the British Menopause Society clinician tool Migraine and HRT, reviewed April 2026.
1. Why migraine changes in your forties
Low oestrogen is not the trigger. The drop is. Your oestrogen level falls in the days before a period, and for a lot of women that fall is what starts an attack.
The Migraine Trust puts the scale of it plainly. Attacks linked to periods are “thought to affect as many as two-thirds of women with migraine”.
Perimenopause is the stretch from when your cycle starts to go irregular until a year after your last period. It usually begins in the mid-forties. The pattern you had breaks. Cycles shorten, then stretch out. Oestrogen climbs higher than it used to and falls harder.
So you get more of the trigger, at less predictable times. The Migraine Trust is direct about the result: “It’s common to have more frequent and severe migraine attacks during perimenopause.”
One London menopause clinic shows how ordinary this is. Migraine affected 42% of the women attending, and a fifth of those had daily headaches. Nearly four in five reported severe or substantial disability on a standard headache impact score.
There is a decent ending to this. Once the swings stop, attacks “become less severe and less frequent” and “may even disappear altogether”. Not for everyone. For some, migraine carries on after menopause or gets worse.
2. The aura rule that comes first
Before anything else, one question. Do you get aura?
Aura is a short set of neurological symptoms that arrive before the headache and then pass. Zigzag lines. Flashing lights. A blind spot that spreads. It clears within an hour. About one in three migraine attacks has one, and more than 90% of auras are visual.
This matters because of contraception. The Migraine Trust says: “If you have migraine with aura, you should not take any combined hormonal contraception.” Aura and the combined pill each carry a very small rise in stroke risk. Together the rise is bigger.
If you are on the combined pill and aura is new, tell your GP or your contraception clinic. Do not wait for a routine appointment. The progestogen-only pill is not affected by this rule.
Now the part that gets confused with it. HRT is not the combined pill. It uses different hormones at much lower doses, and the British Menopause Society is explicit with clinicians:
“Migraine aura does not contraindicate hormone replacement therapy.”
— British Menopause Society, Tool for Clinicians: Migraine and HRT, reviewed April 2026
Plenty of women are told otherwise and go without. That is a conversation for your GP, not something to act on from a web page. Take the sentence above with you.
3. What a blood test can and cannot show
Start with the honest half. Nothing we sell measures the oestrogen swing that is driving your attacks.
Our Hormone Balance panel (£99) does not include oestradiol, the main form of oestrogen. Even if it did, one reading on one day cannot describe a level that moves week to week. A single oestrogen number is not the answer here, whoever is selling it.
NICE takes a similar line with GPs. If you are 45 or over, guidance is to identify perimenopause from your symptoms and your cycle, not from bloods. FSH is worth considering between 40 and 45 when your cycle has changed, and under 40 where early menopause is suspected.
What is left is context. FSH and LH are the signals your brain sends to your ovaries, and they climb as the ovaries respond less. SHBG is the protein that carries sex hormones around. Read together, they place you on the map.
Our perimenopause blood test guide covers what each marker settles, and the menopause hub has the wider picture. Testing earns its place for the second job below, not for confirming what your calendar already tells you.
4. When it turns out not to be hormones
This is the real reason to test. Past 45, almost everything gets filed under perimenopause, including things that are not.
An underactive thyroid is the classic. It shares the tiredness, the low mood, the weight change and the fog, and it becomes more common in exactly this decade. TSH and Free T4 separate the two in one draw. Our guide on telling menopause and thyroid apart walks through how the pictures differ.
Then the nutrients. Low vitamin D, low B12 and low iron stores all sit behind headaches and flat energy that get blamed on hormones. None of them causes migraine, and we are not saying they do.
The point is narrower. You want them off the table before you conclude this is your cycle. Our headache and migraine blood test guide sets out the full marker list.
Our General Energy & Wellness panel (£149) carries TSH, Free T4, vitamin D, B12, magnesium and cortisol together, from a home finger-prick sample. If iron is your main question, the Vitamins & Minerals panel (£159) reads ferritin alongside the rest of the iron workup.
One last thing, and it overrides everything above. A headache that hits full force in seconds, or comes with fever and a stiff neck, or brings new weakness or speech trouble, is an emergency. Call 999 or go to A&E. A blood test is not the right move for any of those.
Frequently asked questions
Can a blood test confirm my migraines are hormonal?
No. The trigger is a drop in oestrogen over days, and no single blood sample can capture that. A headache diary kept beside your cycle dates does the job better. Bloods are useful for the separate question of what else might be going on.
Does Helvy measure oestrogen?
Not in the Hormone Balance panel. It reads FSH, LH, SHBG, total testosterone and the free androgen index. Oestradiol and progesterone are not included. If a clinician wants oestrogen tracked directly, that is a separate test to arrange with them.
I get aura. Does that rule out HRT?
The British Menopause Society tells clinicians that migraine aura does not contraindicate hormone replacement therapy. That is different from the combined contraceptive pill, which is not advised with aura. HRT is a prescription decision, so take the question to your GP.
Will my migraines stop after menopause?
Often, but not always. The Migraine Trust says attacks commonly become less severe and less frequent once the hormone swings settle, and may go entirely. It also notes that migraine sometimes continues after menopause, or gets worse.
Which markers are worth checking if my headaches got worse?
TSH and Free T4 for thyroid, plus vitamin D, B12 and ferritin for the nutrient side. FSH, LH and SHBG add where you sit in the transition, which is most informative between 40 and 45. None of these diagnoses migraine. They tell you what else is in play.
Stop guessing which decade this is
Our Hormone Balance panel (£99) reads FSH, LH, SHBG, total testosterone and the free androgen index. Home finger-prick kit, results usually within 5 working days of the lab receiving your sample, from UKAS-accredited UK laboratories.
Medical disclaimer: This content is for informational purposes only and does not constitute medical advice, diagnosis, or treatment. Helvy blood tests measure biomarkers and do not diagnose migraine, menopause or any other condition.
HRT and contraception are prescription decisions for a qualified clinician. Do not start, stop or change any medicine based on this article. If a headache comes on suddenly and severely, or with fever, a stiff neck, weakness or trouble speaking, call 999. All Helvy blood tests are processed by UKAS-accredited UK laboratories to ISO 15189.
Last updated: August 2026 · By Helvy · Medically analysed at UKAS-accredited UK laboratories
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