Can Inflammation Cause Migraine? What Researchers Mean by Neurogenic Inflammation

Pain that starts in the brain's wrapping

About 15.1% of people in the world have it, and up to 2% of people go on to have chronic migraine, with attacks on most days.2

So where does the pain come from? Migraine is linked to the meninges, the thin layers that wrap the brain. These layers are wired with branches of the trigeminal nerve, the big nerve of the face and head.1 When scientists stimulate this nerve around large blood vessels, it brings on headache patterns like migraine.1

This is where "neurogenic inflammation" comes in. Neurogenic means "started by nerves." When the nerve endings in the meninges fire, they release small signaling proteins called neuropeptides. Those signals act on nearby cells and tissues and set off inflammation right there.1 It is not like an infection. Nothing is invading. The nerves themselves start it.

One of those neuropeptides is CGRP. A 2023 review pooled 19 large trials with 14,584 people. Drugs that target the CGRP pathway lowered monthly migraine and headache days compared with a placebo.6 That is not proof that inflammation starts migraine. It does show that one signal from this nerve system matters a lot.

Can inflammation cause migraine, or does it follow?

Blood tests give the next clue. Cytokines are proteins the immune system uses to send messages. Some, such as IL-6 and TNF-alpha, push inflammation up.

People with migraine had higher IL-6, TNF-alpha and IL-8 than healthy people in a pooled look at 38 studies.From a 2023 meta-analysis in J Headache Pain

A 2023 meta-analysis (a study that pools many studies) looked at 38 studies, with 1,335 people with migraine. Compared with healthy people, those with migraine had higher IL-6, TNF-alpha and IL-8. During an attack, another signal, IL-1 beta, was higher than between attacks.4

A bigger 2025 meta-analysis covered 57 studies. It found that different signals line up with different stages.3

• Having migraine at all: higher IL-6 and TGF-beta in people with episodic migraine.3
• During an attack: higher IL-1 beta than between attacks.3
• Getting worse over time: higher IL-6 in chronic migraine than in episodic migraine.3

That last finding fits an idea from a 2019 review. Its authors proposed that as attacks become more frequent and turn chronic, nerve-driven inflammation may build up in the nerves and support cells of the head's pain system.2 Most of the support for that idea so far comes from lab research, not people.2

Here is the honest limit. The 2023 authors wrote that new studies following people over time are needed "to confirm causality," because a snapshot can't tell you whether inflammation helps trigger attacks, attacks raise inflammation, or both come from something else.4

Is migraine a kind of brain inflammation?

Not in the way most people picture it. A 2022 review gathered 20 brain imaging studies. In migraine without aura, scans found no sign of activated immune cells called macrophages.5 In migraine with aura (the kind with visual changes before the pain), scans did suggest immune activity in and around the brain's coverings.5 Leaky blood vessels, another sign of inflammation, showed up mostly in a rare type called hemiplegic migraine.5

So the picture is patchy, and it may differ by migraine type.5

Does an anti-inflammatory diet help migraine?

A 2025 review of six observational studies with 31,958 people linked an anti-inflammatory diet to fewer and less severe migraine attacks.7 One study in it found the opposite for chronic daily headache, and the authors said better long-term studies are needed.7

Trials tell us more. In a 2021 randomized trial, 182 adults with migraine on 5 to 20 days a month ate one of three diets for 16 weeks.8 Two diets raised two fish fats, EPA and DHA, to 1.5 g a day. One of them also cut linoleic acid, a fat found in many cooking oils.8 Compared with the usual diet, they cut headache days by 4.0 and 2.0 days a month.8 But quality of life scores did not improve in a meaningful way.8 And the diets did not change CGRP.8

Fish oil pills alone look weaker. A 2018 meta-analysis of randomized trials found omega-3s did not change how often or how badly migraine struck, but attacks were about 3.44 hours shorter.9

A 2025 review of eight diet trials rated the evidence strong that two eating plans cut how often attacks came: DASH, an eating plan first built to lower blood pressure, and the ketogenic (very low carb) diet.10 DASH also eased how severe attacks were.10 The authors still called for more high-quality studies.10

Where exercise fits

A 2024 network meta-analysis pooled 28 studies with 1,501 people with migraine. Yoga, hard aerobic exercise and moderate steady aerobic exercise each beat medicine alone for cutting how often attacks came.11 The authors rated that evidence very low quality, so treat it as a promising lead.11

The bottom line

Nerve endings in the brain's wrapping, spilling signals into the tissue around them. Blood tests where IL-6 runs higher in migraine and higher still as it turns chronic. Drugs that work by blocking one of those nerve signals. Every thread points the same way: inflammation is part of how migraine works. No one has shown yet that it starts it, which is why we grade this Emerging. The steps with the best trials, more fish, a DASH-style plate and regular movement, are worth a few months of honest tracking.