Background: Emerging evidence suggests that air pollution, particularly fine particulate matter (PM2.5), may exacerbate migraine. Northern Thailand experiences severe seasonal air pollution, offering a unique context to investigate this association. This study aimed to evaluate the impact of seasonal PM2.5 exposure on migraine frequency, severity, emergency room (ER) visits, and medication use.
Methods: This retrospective observational study included 42 adult migraine patients attending a university hospital's headache clinic from 2021 to 2023 who completed monthly headache diaries. PM2.5 data were obtained from national monitoring networks. "Polluted months" (January-May) were compared with "non-polluted months" (June-December). Study outcomes included headache frequency (days/month), pain severity (mild/moderate/severe), ER visits, and medication use.
Results: Among 42 patients (mean age: 39.2 years; 57.1% female), headache frequency was higher during polluted months (6.4 vs 4.3 days/month, P < 0.001). All pain severity levels increased significantly during polluted periods. ER visits rose markedly (3.37 vs 0.65 visits/patient, P < 0.001). Use of both migraine-specific and non-specific medications per patient was significantly greater in polluted months.
Conclusion: PM2.5 exposure is associated with increased migraine burden. Seasonal air pollution may worsen headache frequency, severity, and healthcare utilization. Air quality should be considered in migraine management and environmental policy planning.
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