Caffeine Headache – Causes, Relief & Withdrawal (2026)

Caffeine Headache

Caffeine cures headaches — and causes them. Here's how both work.

✓ Last reviewed March 2026

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MyCaffeineCalculator Health Research Team

Evidence-based guide reviewed March 2026.

Why Caffeine Both Relieves and Causes Headaches

Caffeine is a double-edged sword for headaches. It's an ingredient in several over-the-counter pain relievers (Excedrin, Anadin Extra) because it genuinely helps — but it also causes a specific type of rebound headache in regular users who skip their daily dose.

How caffeine relieves headaches

Caffeine is a vasoconstrictor — it narrows blood vessels. Many headaches, including migraines and tension headaches, involve dilated cerebral blood vessels. Caffeine constricts these vessels, directly addressing one of the main mechanisms of headache pain. It also enhances the absorption and effectiveness of pain relievers like acetaminophen and ibuprofen by up to 40%, which is why it's added to combination headache products.

How caffeine causes withdrawal headaches

Regular caffeine use causes the brain to upregulate adenosine receptors. When caffeine is missed — even by a few hours in heavy users — adenosine floods the now-excess receptors, causing cerebral blood vessels to dilate rapidly. This dilation produces the characteristic throbbing withdrawal headache, typically starting in the temples or behind the eyes.

The rebound cycle: Person gets withdrawal headache → drinks coffee → headache goes away → tomorrow, needs caffeine again to avoid headache → repeat. Breaking this cycle requires tolerating 2–5 days of withdrawal headaches during a gradual taper or cold turkey quit.

Caffeine in Headache Medications

Medication	Caffeine per Dose	Other Active Ingredients
Excedrin Migraine / Extra Strength	65mg per 2 tablets	Acetaminophen 500mg + Aspirin 500mg
Anadin Extra (UK)	45mg per 2 tablets	Aspirin 300mg + Paracetamol 200mg
Cafergot (prescription)	100mg per tablet	Ergotamine 1mg
Fioricet / Fiorinal (prescription)	40mg per tablet	Butalbital 50mg + Acetaminophen 325mg

Warning about caffeine-containing pain relievers: Using caffeine-containing headache medications more than 10–15 days per month can cause "medication overuse headache" (MOH) — a rebound effect where the medication itself becomes a headache trigger. This is especially common with Excedrin. If you use it more than twice a week, discuss with your doctor.

Frequently Asked Questions

Does caffeine help headaches?

Yes, for some types. Caffeine relieves headaches by constricting dilated cerebral blood vessels and by enhancing the effectiveness of pain relievers by up to 40%. It's particularly effective for migraines and tension headaches where vascular dilation is a component. However, it provides no benefit for headaches caused by other mechanisms (e.g., dehydration, sinus pressure).

How do I get rid of a caffeine withdrawal headache?

The fastest relief is caffeine itself — even 50–100mg will typically resolve a withdrawal headache within 30–45 minutes. If you're trying to quit caffeine, over-the-counter ibuprofen or acetaminophen (without caffeine — avoid Excedrin) can provide partial relief. Staying hydrated and resting in a dark, quiet room helps. The headache will resolve on its own within 24–48 hours as adenosine receptors begin to normalize.

How long does a caffeine headache last?

A caffeine withdrawal headache typically starts 12–24 hours after the last caffeine dose, peaks at 20–48 hours, and resolves within 2–5 days without treatment. If you relieve it with caffeine, it will return the next time caffeine is missed. Breaking the cycle requires tolerating the headache phase during a deliberate quit or taper.

Medical Disclaimer: Educational guide based on published research. Not medical advice. Consult a healthcare provider for personalised guidance. Last reviewed March 2026.