By Leila Martyn, Founder of MyOva

Hormonal headaches are real, and if yours seem to arrive like clockwork in the days before your period, there is a clear physiological reason why. The main trigger is not low oestrogen itself, it is the sharp drop in oestrogen that happens right before bleeding starts. That withdrawal affects pain pathways in the 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 experience migraine notice a clear link to their cycle, and a smaller group only ever get migraines around their period [1, 4]. The useful part is this: once you understand what is driving a hormonal headache, there is a lot you can do, from tracking your pattern, to supporting the two nutrients most studied for headache frequency (magnesium and vitamin B6), 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

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 is not arbitrary. It is 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 have 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.

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 key detail is often missed: 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.

The period window is the most common trigger, but it is not 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 does not 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.

Magnesium is one of the most researched nutrients in headache science, and it is a sensible place to start. Some women who experience migraine have been found to have lower magnesium status than those who do not, particularly around the time of their period [6]. A randomised, placebo-controlled trial published in the Journal of Headache and Pain tested a supplement combining magnesium, riboflavin (vitamin B2), and coenzyme Q10, and found a meaningful improvement in migraine symptoms compared with placebo [5]. A separate systematic review and meta-analysis of vitamins and minerals for migraine prophylaxis reached a broadly similar conclusion for magnesium [6].

It is worth being precise about what this evidence does and does not 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.

Vitamin B6 contributes to normal hormonal activity and normal psychological function, and it is one of the most consistently studied nutrients in premenstrual research generally. We have 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.

Alongside anything you are 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 is 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 are usually well tolerated.
• Protect your sleep. An inconsistent bedtime routine makes almost every hormonal symptom, headaches included, harder to manage.

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

• A sudden, severe headache unlike any you have 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 is 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 is exactly the kind of pattern a GP will want to see.

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 is 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 alongside 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 is sudden and severe, accompanied by fever, confusion, vision changes or weakness on one side, or if it is 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.

• 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 Is Telling You)
• 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)

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. Available at: pubmed.ncbi.nlm.nih.gov/37730536
4. Georgetown University Medical Center. A third of women experience migraines associated with menstruation, most commonly when premenopausal. Available at: meded.georgetown.edu/news-releases
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. Magnesium in headache. In: Magnesium in the Central Nervous System [Internet]. NCBI Bookshelf, 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

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.