Wildfire smoke linked to surge in migraine hospital visits, Canadian study finds

OTTAWA — A new Canadian study has found that migraine‑related hospital visits rise sharply during periods of wildfire smoke, underscoring the growing health toll of worsening fire seasons.

Researchers from Health Canada analyzed nearly one million emergency visits for migraine and severe headache conditions in Alberta and Ontario between 2010 and 2023. They discovered a 6 per cent increase in hospital trips linked to fine particulate matter (PM 2.5) from wildfires — particles roughly 30 times thinner than a human hair.

Neurologist Dr. William Kingston of Toronto’s Sunnybrook Health Sciences Centre called the spike “a hefty number,” noting that migraines already affect about 14 per cent of Canadians. He said smoke, stress, and weather changes can act as external triggers, urging patients to manage symptoms more aggressively during smoky periods.

Health experts recommend checking daily air‑quality indexes, keeping windows closed, using air filtration systems, and wearing N95 masks outdoors when pollution levels are high.

The findings, published in JAMA, add to mounting evidence that wildfire smoke contributes not only to respiratory and cardiac problems but also to neurological impacts — a concern as Canada faces record‑breaking fire seasons.

Conclusions from the Study:

In this large case-crossover study of ED visits in Alberta and Ontario, acute exposure to wildfire-sourced PM2.5 was associated with increased ED visits for MOPHS. Associations were observed across provinces, sexes, and most age groups and were greater in magnitude for wildfire-sourced PM2.5 than for PM2.5 on non-WFDs. Further research examining potential mediating pathways, including mental health-related mechanisms,32 and evaluation of interventions, such as reducing smoke exposure through indoor air filtration, N95 masking, and other avoidance strategies, may help inform future public health responses to WFS exposure.31

Further Reading: 

https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2852072?guestAcces…

https://www.cbc.ca/news/health/migraine-wildfire-study-9.7282333?