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Definition
Asthma is a disease of the lungs -- specifically of the small airways, called bronchioles, which become narrowed, inflamed, and choked with mucus. This bronchiole blockage causes the breathing problems that occur in asthma.


MEDICAL REVIEW: Reviewed by Michael W. Smith, MD, May 2004

SOURCE DOCUMENTATION: Scientific American Medicine, The Merck Manual, 17th edition

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