File:Asthma before-after.png

Summary

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

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