Asthma is a disease that affects the breathing passages of the lungs (bronchioles). Asthma is caused by chronic (ongoing, long-term) inflammation of these passages. This makes the breathing passages, or airways, of the person with asthma highly sensitive to various "triggers."
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Asthma Related Resources
Asthma Images and Slideshows
Asthma A-Z List: Complete Listing of Asthma Related Information