Why air pressure triggers migraines (and what to do)

It's a real thing

If your headaches come on before the weather visibly changes, you have what's called a pressure-sensitive or barometric migraine. The science isn't fully nailed down, but the pattern is well-documented.

What's actually happening

Air pressure at sea level sits around 1013 hectopascals. When a storm approaches, it can drop 10 to 20 hPa over a few hours. Several theories explain why this triggers migraines:

• Trigeminal nerve sensitivity. The nerve that handles facial sensation gets irritated by pressure changes.
• Sinus pressure imbalance. Air-filled sinuses don't equalise instantly with the outside.
• Vascular changes. Blood vessels in the brain dilate as pressure drops.
• Serotonin shifts. Falling pressure may trigger neurotransmitter changes.

What to do

Watch the forecast

Most weather apps don't surface barometric pressure. Open Window Today's "Migraine risk" card flags incoming pressure drops large enough to set off a migraine.

Treat early

The single biggest factor in migraine outcome is how fast you take medication. Triptans and acute NSAIDs work much better when taken at first warning signs (fatigue, neck stiffness, aura, yawning) than once full pain has set in.

Stack the small wins

• Hydrate aggressively. Pressure-drop days need extra water.
• Sleep eight hours the night before a forecast pressure drop.
• No alcohol, no skipped meals on warning days.
• Moderate caffeine. Too much makes rebound worse.

Daily preventatives if you get three or more a month

Your GP can prescribe a daily preventative such as propranolol, topiramate, amitriptyline, or one of the newer CGRP-blockers. These cut frequency by half or more for most people. Worth asking about if weather is a regular trigger.

What doesn't help

Migraine bracelets, ear plugs, magnesium-only protocols. Light evidence at best. Spend your money on proper acute treatment and a dark, quiet room.

Related reads