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Your morning coffee is probably the one habit you’d rather nobody question. But if you live with migraine, you’ve likely wondered about it yourself: could that cup be connected to your attacks? So, does coffee cause migraines? The research doesn’t give a simple yes or no. It points to a pattern instead. How much you drink, how fast, and how consistently seem to matter more than the coffee itself. And if your brain already runs on a tight salt and water balance, how you drink your coffee may matter as much as how much.
In a six-week diary study, Prospective Cohort Study of Caffeinated Beverage Intake as a Potential Trigger of Headaches among Migraineurs, researchers followed 98 adults with episodic migraine. One or two caffeinated drinks a day were not linked to a higher chance of a headache that day. Three or more servings were, on that day or the next.¹ A serving was roughly one cup of coffee.
The same research group later looked at habitual intake. Habitual Caffeinated Beverage Consumption and Headaches Among Adults With Episodic Migraine found no difference in monthly headache days between people who drank none, one to two, or three to four servings a day. The authors noted the estimates were imprecise, and few participants drank much.²
A 2026 systematic review of 19 studies, The Impact of Caffeine Consumption on Migraine, reached a similar conclusion. The relationship is complex and context-dependent. Genetic studies linked a lifelong tendency toward higher coffee intake with lower migraine risk. Acute excessive intake and sudden changes in caffeine habits were linked to attacks in some people.³
Most of this evidence is observational, so it shows association, not proof. But “a lot at once” and “suddenly different” keep showing up.
Caffeine’s reputation as a headache remedy is partly earned. It is a common ingredient in over-the-counter pain relievers. But a review titled Caffeine and Primary (Migraine) Headaches—Friend or Foe? described its pain-relieving effect as modest at best. It also noted that regular daily use seems to add to headache burden, and that stopping abruptly after regular use can bring on a withdrawal headache.⁴
That is the pattern behind the myth. Caffeine may take the edge off a headache in the moment, while the daily habit, and the dip when a cup is late, can keep the cycle going.
Caffeine has acute effects on heart rate and blood pressure. Caffeine and Blood Pressure: A Critical Review Perspective lists several proposed mechanisms: blocking adenosine receptors, activating the sympathetic nervous system, stimulating stress-hormone release, and effects on the kidneys. The kidney effects include increased urine and sodium excretion and activation of the renin–angiotensin–aldosterone system.⁵
Sodium is where this connects to migraine. Migraineurs excrete about 50% more sodium in their urine than people without migraine.⁶ In Specifically Formulated Ketogenic, Low Carbohydrate, and Carnivore Diets Can Prevent Migraine: A Perspective, Angela Stanton, PhD, proposes why. The migraine brain has more sensory neuronal connections, so it needs more action potential, and more sodium, to run the extra electrical activity. Her hypothesis is that too little sodium in the extracellular space around sensory neurons leads to failed action potentials.⁷
The same paper notes that when insulin drops, as it does during fasting, the body loses more sodium and water, because high insulin is what keeps the kidneys holding onto sodium.⁷ That describes the first cup of the morning for many people: an overnight fast, low insulin, no salt, no water. If caffeine nudges sodium loss further, the margin gets thinner. No study has tested coffee against sodium status in migraine directly, so this is a physiological link, not a proven one. It is one reason mornings can feel so fragile, which we cover in What Causes Early Morning Migraines?
Blood sugar matters here because of how glucose moves. Glucose enters cells alongside sodium through sodium-glucose cotransporters, called SGLT1 and SGLT3 in the brain. Of the major electrolytes, sodium is the one glucose actively pulls with it.⁷
Caffeine adds a separate wrinkle. A meta-analysis of seven randomized crossover trials found that acute caffeine intake reduced insulin sensitivity in healthy adults, meaning the body handled glucose less efficiently afterward. Results varied across trials.⁷ If the sodium-glucose link holds for the migraine brain, anything that makes glucose handling less efficient is worth noticing. A sweetened latte on an empty stomach stacks a sugar load on top of the caffeine. We unpack the sugar–sodium connection in Cravings Are Clues.
There isn’t one. Skipped meals, poor sleep, stress, dehydration, hormonal shifts, heat, and blood sugar swings all show up in people’s stories, and they share a thread. Each one affects brain energy and electrolyte balance. We follow that thread in When Healthy Habits Backfire. Coffee is one input among many. It rarely acts alone, but it adds to the total load.
Related Reading on Health By Principle
Mostofsky E, Mittleman MA, Buettner C, Li W, Bertisch SM — Prospective Cohort Study of Caffeinated Beverage Intake as a Potential Trigger of Headaches among Migraineurs. The American Journal of Medicine, 2019;132(8):984–991. DOI: 10.1016/j.amjmed.2019.02.015
Mittleman MR, Mostofsky E, Vgontzas A, Bertisch SM — Habitual Caffeinated Beverage Consumption and Headaches Among Adults With Episodic Migraine: A Prospective Cohort Study. Headache, 2024;64(3):299–305. DOI: 10.1111/head.14673
Makhlouf HA, Khelifa H, Batarseh SF, et al. — The Impact of Caffeine Consumption on Migraine: A Systematic Review. BMC Neurology, 2026;26:326. DOI: 10.1186/s12883-026-04955-w
Alstadhaug KB, Andreou AP — Caffeine and Primary (Migraine) Headaches—Friend or Foe? Frontiers in Neurology, 2019;10:1275. DOI: 10.3389/fneur.2019.01275
De Giuseppe R, Di Napoli I, Granata F, Mottolese A, Cena H. Caffeine and blood pressure: a critical review perspective. Nutr Res Rev. 2019;32(2):169–175. doi:10.1017/S0954422419000015
Campbell, Tonks & Hay — An Investigation of the Salt and Water Balance in Migraine. British Medical Journal, 1951.
Stanton AA — Specifically Formulated Ketogenic, Low Carbohydrate, and Carnivore Diets Can Prevent Migraine: A Perspective. Frontiers in Nutrition, 2024;11:1367570. DOI: 10.3389/fnut.2024.1367570
