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Why does exercise trigger asthma?

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During normal breathing, the air we take in gets warmed and moistened by the nasal passages first. Because people tend to breathe through their mouths when they exercise, they're inhaling colder and drier air.

For people who have exercise-induced asthma, the muscle bands around their airways are sensitive to these changes in temperature and humidity. They react by contracting, which narrows the airway and causes their asthma symptoms.

From: Exercise-Induced Asthma WebMD Medical Reference

SOURCES: American Academy of Allergy Asthma & Immunology: "Allergic Conditions: Exercise-Induced Asthma (EIA)." American College of Allergy, Asthma, & Immunology. Exercise-Induced Brochoconstriction (EIB) American Lung Association: "Search LungUSA." Boehringer Ingelheim: "US FDA Expands Approval of Tiotropium Respimat® for Maintenance Treatment of Asthma in Children." FDA. Prescribing Information: Spiriva Respimat.



 

Reviewed by Louise Chang on April 14, 2018

SOURCES: American Academy of Allergy Asthma & Immunology: "Allergic Conditions: Exercise-Induced Asthma (EIA)." American College of Allergy, Asthma, & Immunology. Exercise-Induced Brochoconstriction (EIB) American Lung Association: "Search LungUSA." Boehringer Ingelheim: "US FDA Expands Approval of Tiotropium Respimat® for Maintenance Treatment of Asthma in Children." FDA. Prescribing Information: Spiriva Respimat.



 

Reviewed by Louise Chang on April 14, 2018

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When are symptoms of exercise-induced asthma?

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