Your triggers are a guess

48% believed stress triggered their headaches. 23% had elevated stress. And almost no one suspected the thing half of them were actually exposed to.

In a study of headache in young people, researchers asked two things. What do you think triggers your headache? And then they measured what risk factors were actually present. The two lists didn't look alike.

48 versus 23

48% of the young people pointed to stress as a possible trigger for their headache. When the researchers measured how many actually had elevated stress scores, the figure was 23%. More than twice as many suspected stress as actually carried it.

That's not proof stress is innocent. It's proof that the feeling of being able to point to the culprit — "it was stress" — isn't the same as having measured it.

The triggers almost no one suspected

The same study turned the question around. Too much alcohol was suspected by 7%. Neck pain by 4%. Physical inactivity by 0.3%. Coffee by no one at all — 0%.

But when the researchers measured the actual risk factors, the picture was different: 56% were exposed to what corresponds to the alcohol factor. 51% had neck pain. 36% were physically inactive. 14% had the coffee consumption.

Put the two lists side by side, and the pattern is clear. What people suspect and what's actually present are largely two different lists. Not because people don't think it through. Because that kind of connection is invisible to the eye unless someone measures it.

The weather gets the same treatment

It's not just stress, alcohol and coffee. A review in Practical Neurology points specifically at the weather: more patients believe weather is a trigger for their headache than the evidence supports. The review itself points to the main limitation — it rests on the patient's own memory and their own selection of what's worth noticing.

A review in Current Pain and Headache Reports recently put a figure on how much weather actually explains, once you pool the best available evidence: the predictive value of weather events is only 20%. The same review notes that the response is individual — some patients react to low pressure, others to high, and if you lump them together into a single average curve, they can cancel each other out.

Individual variation may play a role in how air pressure affects migraine, because some patients are sensitive to low pressure while others are sensitive to high pressure.

Why a guess isn't enough

None of the studies say stress or weather don't matter. They say something more precise: the list you'd write yourself, if someone asked you to guess your triggers, isn't reliable — not by too much, and not by too little. Some of your real triggers are probably not on it at all.

That's exactly the list Aneroid doesn't ask you to write. The app measures instead of asking you what you think.