Chinook winds and migraine headache.

Area of Science:

• Environmental Medicine
• Neurology
• Meteorology

Background:

• Migraineurs frequently report weather as a headache trigger, though scientific evidence is limited.
• Chinook winds, a regional weather phenomenon in Alberta, Canada, are often cited by migraineurs as a specific trigger.

Purpose of the Study:

• To investigate the association between chinook weather conditions and the probability of migraine headache onset.
• To identify specific weather patterns within chinook events that may influence migraine susceptibility.

Main Methods:

• Utilized Environment Canada weather data to classify days as chinook, pre-chinook, or non-chinook.
• Collected headache data from 75 patient diaries from the University of Calgary Headache Research Clinic.
• Employed logistic regression models to analyze the impact of weather conditions on migraine onset probability.

Main Results:

• Both pre-chinook days (OR 1.24) and chinook days (OR 1.19) showed increased migraine onset probability compared to non-chinook days.
• High-wind chinook days (velocity > 38 km/h) significantly increased migraine risk (OR 1.41).
• Subsets of individuals were sensitive to either pre-chinook or high-wind chinook conditions, with few sensitive to both. Age correlated with high-wind chinook sensitivity.

Conclusions:

• Pre-chinook and high-wind chinook weather conditions are associated with increased migraine onset probability in specific patient subsets.
• The distinct sensitivities suggest potentially independent underlying mechanisms for pre-chinook and high-wind chinook migraine triggers.
• Age is a factor in sensitivity to high-wind chinook events, but not pre-chinook events, further supporting distinct trigger mechanisms.