By Leila Martyn, Founder of MyOva

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If your head starts pounding like clockwork in the days before your period, you're not imagining it. There is a clear physiological reason it keeps happening, and it isn't bad luck or low pain tolerance.

The trigger isn't low oestrogen itself. It's the speed of the drop. In the day or two before bleeding starts, oestrogen falls sharply from its post-ovulation peak, and that fall affects the pain pathways in your brain in a way that can bring on anything from a dull, band-like tension headache to a full migraine with nausea and light sensitivity.

Around half of women who get migraines notice a clear link to their cycle, and a smaller group only ever get migraines around their period [1, 4]. Your body is trying to tell you something, and once you understand what is actually driving it, there is a lot you can do about it, from tracking your pattern, to supporting the two nutrients most studied for headache frequency, to knowing exactly when a headache needs a GP rather than a paracetamol.

In this guide:

• What are hormonal headaches, and how do you know if you have one?
• Why do headaches strike right before your period?
• What else can trigger a hormonal headache besides your period?
• Does magnesium actually help with hormonal headaches?
• What about vitamin B6?
• What can you actually do when a hormonal headache hits?
• When should you see a GP about hormonal headaches?
• Frequently asked questions

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What Are Hormonal Headaches, and How Do You Know If You Have One?

A hormonal headache (sometimes called a menstrual headache or menstrual migraine) is a headache that reliably clusters around a specific window of your cycle, usually from two days before your period starts to the first two or three days of bleeding [2, 3]. This window isn't arbitrary. It's defined by the International Headache Society specifically because it maps onto the sharpest hormonal shift of the entire cycle.

Clinicians generally split this into two patterns [3]:

• Pure menstrual migraine: migraines that only ever occur in that cycle related window, and never at any other time of the month. This is thought to affect a minority of migraine sufferers.
• Menstrually related migraine: migraines that occur both around the period and at other points in the cycle, but tend to be noticeably worse, longer, or harder to treat in that cycle related window.

Research consistently finds that menstrual and menstrually related migraines tend to be more severe, last longer, and respond less well to standard over the counter treatment than migraines that fall outside this window [3, 4]. If you've ever wondered why the same painkiller that usually works for you barely touches a period time headache, this is likely why.

Not every hormonal headache is a migraine. Some women experience a duller, band like tension headache in the same window instead, without the nausea, light sensitivity, or visual aura that define migraine. Both patterns share the same underlying hormonal driver.

Why Do Headaches Strike Right Before Your Period?

The leading explanation is known as the oestrogen withdrawal theory, and a 2023 review in the Journal of Headache and Pain revisited decades of evidence and found it holds up well [3]. The research on this is actually pretty clear: it is not low oestrogen that triggers the headache, it is the speed of the drop.

In the days before your period, oestrogen falls sharply from its post ovulation peak. Progesterone falls alongside it. Oestrogen has a direct influence on serotonin activity and on the pain processing pathways in the brain that govern migraine [3]. A rapid fall in oestrogen appears to destabilise those pathways, lowering the threshold at which a headache or migraine is triggered, for a few days, right on schedule, every cycle.

This is also why some women on combined hormonal contraception notice headaches specifically during the pill free or placebo week. The mechanism is the same: a scheduled drop in oestrogen, whether that drop is happening naturally or because a course of active pills has ended.

There is also a magnesium angle to the mechanism itself, not just the management. Falling oestrogen is thought to affect how the brain and blood vessels handle magnesium, and magnesium plays a role in calming the same nerve pathways and blood vessel responses involved in migraine [6]. That is one reason magnesium status comes up so often in menstrual migraine research specifically, rather than migraine research generally.

I hear a version of this story constantly from MyOva customers: a headache that shows up like clockwork, gets waved off as "just a period thing," and never gets looked at as its own pattern worth tracking. Your diagnosis, if you have one, is a starting point, not a verdict on what you have to put up with every month.

What Else Can Trigger a Hormonal Headache Besides Your Period?

The period window is the most common trigger, but it isn't the only one. A few other points in hormonal life carry the same underlying mechanism: a change in oestrogen that outpaces the brain's ability to adjust.

• Perimenopause. Oestrogen doesn't decline smoothly in perimenopause, it fluctuates, sometimes sharply, from cycle to cycle. Many women notice new headaches or worsening migraine for the first time during this stage. Our complete guide to perimenopause covers what else tends to shift during this transition.
• Ovulation. A smaller, secondary dip in oestrogen around ovulation can trigger a milder version of the same pattern in some women, roughly midway through the cycle.
• Starting or stopping hormonal contraception. Any change that creates a sudden shift in circulating oestrogen, including the pill free week on combined contraception, can bring on the same withdrawal type headache.
• Broader hormonal imbalance. If headaches are one symptom among several, alongside mood changes, fatigue, or irregular cycles, it is worth looking at the wider picture. Our guides to 5 signs your hormones are out of balance, oestrogen dominance, and low progesterone walk through the other signals worth tracking alongside your headache pattern.
• Stress and poor sleep. Neither of these causes a hormonal headache on its own, but both lower the threshold at which your brain reacts to an oestrogen drop, which is why a stressful, under slept week before your period often feels noticeably worse than a calmer one.

Does Magnesium Actually Help With Hormonal Headaches?

Magnesium is one of the most researched nutrients in headache science, and it's a sensible place to start. A narrative review of magnesium in headache, covering oral and intravenous supplementation and specific patient groups including menstrual migraine, notes that magnesium deficiency is linked to the processes that drive migraine, and that some women who experience migraine have lower magnesium status than those who don't, particularly around the time of their period [6]. A randomised, placebo controlled trial published in the Journal of Headache and Pain tested a combination supplement containing magnesium, riboflavin (vitamin B2) and coenzyme Q10, and found a meaningful improvement in migraine symptoms compared with placebo [5].

It's worth being precise about what this evidence does and doesn't say. These studies generally used daily magnesium intakes considerably higher than a typical food supplement provides, and they were studying migraine prevention specifically, not treating a headache once it has started. Magnesium contributes to the normal function of the nervous system and to the reduction of tiredness and fatigue, both of which are relevant during the hormonal shifts that precede a period. Read our deeper dive on magnesium as a vital mineral for women's health for the full picture on dose, food sources, and forms.

MyOva Magnesium Nightcap provides 250mg of elemental magnesium as the highly bioavailable bisglycinate form, alongside vitamin B6, as part of an evening wind down ritual rather than a stand alone headache treatment. As with any nutrient at higher intakes, speak to your GP or pharmacist before combining supplements if you are already taking magnesium elsewhere in your routine.

What About Vitamin B6?

Vitamin B6 contributes to normal hormonal activity and normal psychological function, and it's one of the most consistently studied nutrients in premenstrual research generally. We've covered the evidence in detail, including why the active P5P form behaves differently to standard pyridoxine, in why vitamin B6 keeps coming up in PMS research. Both MyOva Hormone Balance and MyOva Cycle Support use the active P5P form for this reason.

What Can You Actually Do When a Hormonal Headache Hits?

Alongside anything you're taking, a handful of everyday habits make a genuine difference to how hormonal headaches feel and how often they show up:

• Track your cycle. Once you know your window (usually two days before your period to two or three days in), you can anticipate it rather than being blindsided by it each month.
• Stay ahead of dehydration. Even mild dehydration compounds headache risk, and it's easy to under drink in the days before your period when bloating can make you feel the opposite of thirsty.
• Keep blood sugar steady. Skipping meals or going long stretches without eating is a common, avoidable headache trigger that stacks on top of the hormonal one.
• Act early. A dim, quiet room and a cold compress at the very first twinge are more effective than waiting until the headache is fully established.
• Watch caffeine and alcohol. Both can worsen hormonal headaches for some women in the days before their period, even if they're usually well tolerated.
• Protect your sleep. An inconsistent bedtime routine makes almost every hormonal symptom, headaches included, harder to manage.
• Keep a simple symptom diary. You do not need an app or a spreadsheet. A note on your phone with the date, how the headache felt, and what you ate, drank or did differently that day is often enough to spot your own pattern within two or three cycles.

When Should You See a GP About Hormonal Headaches?

Most hormonal headaches are uncomfortable rather than dangerous, but a few signs mean it's time to speak to a GP or seek urgent care rather than managing it yourself:

• A sudden, severe headache unlike any you've had before ("worst headache of your life"), especially if it comes on within seconds or minutes.
• A headache accompanied by fever, a stiff neck, confusion, slurred speech, vision loss, or weakness down one side of the body. Treat this as a medical emergency.
• A new headache pattern that starts for the first time after age 50.
• Headaches that are becoming more frequent, more severe, or less responsive to your usual self care over time.
• Migraine with aura while taking the combined contraceptive pill. This combination is linked to a higher stroke risk, and it's worth discussing alternative contraception with your GP or pharmacist.
• Headaches disrupting work, sleep, or daily life most months.

A simple headache and cycle diary, noting the day of your cycle, how the headache felt, and what helped, makes these conversations far more productive, and it's exactly the kind of pattern a GP will want to see.

Frequently Asked Questions

Are hormonal headaches the same thing as PMS headaches? Broadly yes. The timing overlaps with the wider PMS window, and severity can range from a mild tension headache to a full migraine with nausea and light sensitivity [2, 3].

Can the contraceptive pill cause hormonal headaches? Yes, particularly during the pill free or placebo week, when oestrogen drops in the same way it does before a natural period. Some women find a different regimen, including continuous use, reduces this. It's worth discussing with your GP.

Do hormonal headaches get worse in perimenopause? Many women notice new or worsening headaches during perimenopause, when oestrogen fluctuates unpredictably rather than declining smoothly. Read our complete guide to perimenopause for more on this stage.

What doses of magnesium have researchers actually studied for headaches? Trials looking at migraine prevention have generally used daily magnesium intakes considerably higher than a typical food supplement provides, often as part of a combination with other nutrients like riboflavin [5, 6]. This is research into prevention over time, not a same day treatment, and higher intakes should always be discussed with a GP or pharmacist first.

Can diet affect hormonal headaches? Yes. Dehydration and skipped meals are two of the most common everyday triggers that layer on top of the underlying hormonal shift, and both are straightforward to address.

When is a headache before my period something to worry about? If it's sudden and severe, accompanied by fever, confusion, vision changes or weakness on one side, or if it's a genuinely new pattern starting after age 50, seek medical attention rather than waiting it out. See the section above for the full list of red flags.

Related Reading

• Why Vitamin B6 Keeps Coming Up in PMS Research (And What Form Actually Works)
• Magnesium: A Vital Mineral for Women's Health
• 5 Signs Your Hormones Are Out of Balance (And What Each One Means)
• Oestrogen Dominance: Is It Real, What Causes It, and What Can You Actually Do About It?
• Perimenopause: The Complete Guide to What's Happening, Why It Matters, and What You Can Do
• 9 Signs of Low Progesterone (And What Your Body Might Be Telling You)

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This article is for educational purposes only and does not constitute medical advice. MyOva products are food supplements, not medicines, and are not intended to diagnose, treat, cure or prevent any disease. Always consult your GP or pharmacist before starting a new supplement, particularly if you are pregnant, breastfeeding, on medication, or managing a diagnosed condition.

References

1. Migraine Trust. Menstrual migraine. Available at: migrainetrust.org/understand-migraine/types-of-migraine/menstrual-migraine
2. National Migraine Centre. Menstrual migraine factsheet. Available at: nationalmigrainecentre.org.uk/understanding-migraine/factsheets-and-resources/menstrual-migraine
3. Pavlovic JM, et al. Menstrual migraine is caused by estrogen withdrawal: revisiting the evidence. J Headache Pain. 2023;24:126. DOI: 10.1186/s10194-023-01664-4
4. Georgetown University School of Medicine. A third of women experience migraines associated with menstruation, most commonly when premenopausal. 2024. Available at: som.georgetown.edu/?p=17572
5. Gaul C, Diener HC, Danesch U, et al. Improvement of migraine symptoms with a proprietary supplement containing riboflavin, magnesium and Q10: a randomized, placebo-controlled, double-blind, multicenter trial. J Headache Pain. 2015;16:516.
6. Yablon LA, Mauskop A. Magnesium in headache. In: Vink R, Nechifor M, editors. Magnesium in the Central Nervous System [Internet]. Adelaide: University of Adelaide Press; 2011. NCBI Bookshelf ID: NBK507271. Available at: ncbi.nlm.nih.gov/books/NBK507271
7. Cleveland Clinic. Period Headaches (Menstrual Migraines and Hormone Headaches). Available at: my.clevelandclinic.org/health/diseases/8260-menstrual-migraines-hormone-headaches

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References