Portugal's respiratory health landscape reveals a concerning but stable trend, with asthma affecting roughly one in fourteen adults—a figure that has remained relatively unchanged over the past decade despite improved diagnostic methods and growing environmental pressures. This finding challenges assumptions that modern urban living and pollution exposure would drive significantly higher asthma rates in developed European nations.
The comprehensive EPI-ASTHMA investigation, spanning nearly three years and involving over 7,500 initial participants, employed sophisticated two-stage screening protocols to achieve unprecedented diagnostic accuracy. The 7.1% prevalence rate emerged from rigorous clinical evaluations, with the Adult Asthma Score proving remarkably effective at identifying cases. Researchers found that family history of asthma, concurrent nasal and ocular symptoms, and documented food allergies created the strongest predictive profile, together explaining 45% of asthma diagnosis likelihood.
This stability in asthma prevalence contradicts expectations of rising rates driven by climate change, urbanization, and lifestyle factors that typically correlate with respiratory disease burden. The finding suggests Portugal may have reached a demographic equilibrium for asthma prevalence, or that protective factors—potentially including Mediterranean dietary patterns or genetic adaptations—may be moderating expected increases. The strong familial clustering reinforces genetic susceptibility as a dominant factor, though environmental triggers remain crucial for disease expression. For clinicians, the validated screening approach offers practical tools for early identification, particularly valuable given asthma's tendency toward underdiagnosis in adult populations where symptoms often develop gradually.