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Medical News and Perspectives
July 4, 2012

Asthma Forecast: Why Heat, Humidity Trigger Symptoms

JAMA. 2012;308(1):20. doi:10.1001/jama.2012.7533

Researchers have come a step closer to understanding why patients with mild asthma have trouble breathing during hot, humid weather.

In a small study of 6 patients with asthma and 6 healthy controls, researchers at Nationwide Children's Hospital in Columbus, Ohio, and the University of Kentucky in Lexington tested the theory they developed with animal models that hot, humid air activates vagal bronchopulmonary C-fiber sensory nerves, which can cause bronchoconstriction.

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