| A by the numbers look at asthma Dubuque Telegraph Herald Asthma is a chronic disease that affects the airways, the tubes that carry air into and out of the lungs. Asthma causes the inside walls of these airways to become sore and swollen. Allergens that emerge in spring can exacerbate asthma's effects. See all stories on this topic » |
Wednesday, March 21, 2012
Asthma causes
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