Guide
Barometric pressure and headaches: what the research shows
Short answer
For some people, yes: headaches do become more frequent around low or falling barometric pressure. For others there is no link at all, and the research reflects that split. A 2025 review of 14 studies found several that tied pressure drops to more frequent migraine, few that tied them to worse attacks, and none that tied them to longer ones. Large data sets from an emergency department and a Japanese headache app found modest associations; careful diary studies in Berlin and Vienna found none once everyone's data was pooled. The practical step is to log your own headaches for at least eight weeks and compare them with the local pressure.
What the larger studies found
Three studies stand out because of their size or their design.
- Emergency visits in Boston. Mukamal and colleagues looked at 7,054 people who came to one emergency department with a headache between 2000 and 2007 and compared the weather before each visit with the weather on similar days. Higher temperature in the preceding 24 hours had the clearest link. Lower barometric pressure 48 to 72 hours before was also associated with a higher risk of visits for headaches that were not diagnosed as migraine, a smaller effect.
- A headache app in Japan. Katsuki and colleagues analysed 336,951 hourly headache records from 4,375 users of an electronic headache diary. Lower pressure, higher humidity, rain and a significant pressure decrease in the six hours before were all associated with more headaches being logged in a given hour.
- A year of diaries in Utsunomiya. Kimoto and colleagues followed 28 people with migraine who lived within 10 km of the city's weather observatory. Migraine became more frequent when pressure fell by more than 5 hPa from the day of the headache to the next day, and 18 of the 28 linked their attacks to weather changes.
None of these shows that pressure is the reason for any particular headache. They show that, across many people, headache days were not spread evenly across weather.
Why the studies disagree
The same 2025 review by Farah and colleagues explains much of the disagreement. The 14 studies measured pressure in very different ways: some used one reading a day at 6 a.m. or noon, others hourly data, one a sensor carried by the participants. Weather stations sat anywhere from 10 to 50 km from where people lived. Most relied on self-reported diaries, few used a standard scale for severity, and almost none adjusted for other factors such as sleep or hormones.
There is a second, more interesting reason. In a Berlin study of 100 people with migraine, Hoffmann and colleagues found significant weather sensitivity in a subgroup but no significant association when all patients were analysed together. If only some people respond, averaging everyone together dilutes the signal. That may explain why a prospective diary study of 238 people in Vienna concluded that the influence of weather on migraine was small and questionable, while individual patients remain convinced of it.
Low pressure, falling pressure or any change?
Studies did not all measure the same thing, so it is worth being precise about what each one looked at:
- The level. In a Japanese study of 34 people, attacks clustered when pressure sat between 1003 and 1007 hPa, which is 6 to 10 hPa below the 1013 hPa standard.
- A day-to-day fall. The Utsunomiya study used the change from one day to the next, with more than 5 hPa as the threshold.
- A short, sharp fall. The app study looked at the six hours before each headache.
- Weather patterns. The Vienna study found, before correcting for multiple comparisons, that a ridge of high pressure was linked to more headaches, a reminder that the answer is not always low pressure.
If you want to test your own pattern, it helps to pick a definition in advance. Barometric Pressure Tracker uses one: a change of 6 hPa or more within 6 hours counts as a major change, and the pattern card looks at the 24 hours after it.
How pressure might affect the head
Nobody has a settled explanation. The review lists several hypotheses: falling pressure may stimulate the sympathetic nervous system; lower pressure has been reported to increase the firing of neurons in the spinal trigeminal nucleus, a relay station for head pain; pressure differences in the sinuses could act much like the pressure pain of a descending plane, especially in people with structural sinus problems; and lower oxygen saturation at lower pressure might widen blood vessels in the brain.
A separate line of research looks at the inner ear. In 2019, Sato and colleagues lowered the air pressure around mice by 40 hPa and saw activation in part of the vestibular nucleus, the brainstem area that processes balance signals. They suggested the inner ear may act as a pressure sensor. These are plausible routes, not proven ones in people.
How to find out whether it applies to you
- Log every headache, not only the bad ones. Note when it started, how strong it was on a 1–10 scale and whether you took anything for it. A missing entry on a calm-weather day biases the result toward the weather.
- Keep going for at least eight weeks. That is the minimum the UK's NICE guideline suggests for a headache diary, and it gives the weather time to vary.
- Write down the other suspects. Short sleep, skipped meals, alcohol, stress and the menstrual cycle are among the factors people with migraine commonly report, and they can coincide with weather changes. A rainy weekend is also a different weekend.
- Compare with a baseline. If big pressure changes happen around a third of the time where you live, a third of your headaches landing near one is exactly what chance would give you. The question is whether yours land there more often.
See the headache diary guide for the fields doctors find most useful.
Living with weather-sensitive headaches
You cannot change the weather, but a heads-up can still be useful. If you and your doctor have agreed on a plan for attacks, knowing that a sharp fall is due overnight gives you time to keep your usual medication with you and to avoid piling other known factors on top, such as a late night before an early start.
One caution matters here. Taking pain medication often can itself lead to more headaches. NICE advises doctors to consider medication overuse headache when headaches have developed or worsened in people taking triptans, opioids, ergots or combination painkillers on 10 or more days a month, or paracetamol, aspirin or an NSAID on 15 or more days a month, for at least three months. If a weather pattern has you reaching for tablets more often, that is a conversation for your doctor, not a reason to take more.
When a headache needs a doctor
Weather does not explain every headache. NICE lists features that call for prompt assessment, including a headache that reaches its maximum within five minutes, a headache with fever, new weakness, numbness, confusion or a change in personality, a headache after a recent head injury, one brought on by coughing, sneezing, straining or exercise, one that changes with posture, and any substantial change in the character of your usual headaches. If a sudden, severe headache feels like the worst of your life, seek emergency care.