Question 1

Does barometric pressure really cause migraines?

Accepted Answer

Research shows a correlation between pressure changes and migraine onset for many sufferers — particularly drops in pressure. The exact mechanism isn't fully understood, but one theory is that rapid pressure changes affect the pressure differential in sinus cavities and the inner ear. Not everyone is sensitive, and triggers vary significantly between individuals.

Question 2

Is it high or low pressure that triggers migraines?

Accepted Answer

Most research points to the rate of change rather than the absolute value. A rapid drop (such as before a storm) is more commonly linked to migraine onset than sustained high or low pressure. Some people are sensitive to rising pressure as well. If you track your own headaches, you'll likely find a pattern specific to you.

Question 3

How much pressure change is significant?

Accepted Answer

Studies vary, but changes of 5 hPa or more over 24 hours appear frequently in migraine trigger research. Larger swings (8–10+ hPa) correlate with higher rates of reported triggers. Our scoring weights both the peak rate-of-change per 6-hour window and the total swing over the 48h–24h window.

Question 4

What is hPa?

Accepted Answer

Hectopascal (hPa) is the standard unit for atmospheric pressure. It's numerically equal to millibar (mbar). Standard sea-level pressure is 1013.25 hPa. Pressure varies naturally with weather systems, altitude, and season.

Question 5

Can I use this to predict my migraines?

Accepted Answer

This site shows weather data that correlates with reported migraine triggers for some people. It is not a medical device and cannot predict or diagnose your individual symptoms. Use it as one data point among many. Keep a headache diary and consult a healthcare provider to understand your personal triggers.

Question 6

Why does the forecast only cover 2 days?

Accepted Answer

Barometric pressure forecasts are fairly reliable at 24–48 hours but degrade quickly beyond that. Showing a 7-day pressure-trigger forecast would give false confidence in uncertain data. Two days is the window where the data is actionable and reasonably accurate.

Question 7

I have a migraine right now — what should I do?

Accepted Answer

This site is weather data, not medical care. If you are experiencing a severe or unusual headache, please consult a doctor or call your local emergency number if it is an emergency. For ongoing migraine management, a neurologist or headache specialist is the right resource.

Stable pressure in Evanston today — low trigger risk

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