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Keywords: Asthma before-after.png Asthma before-after-en svg During an asthma episode inflamed airways react to environmental triggers such as smoke dust or pollen The airways narrow and produce excess mucus making it difficult to breathe Image from a FDA newsletter http //www fda gov/fdac/features/2003/203_asthma html Uploaded from w Image Asthma before-after png Other version Other versions/Asthma before-after PD-USGov Respiration Asthma |