Asthma is a chronic disease that affects the function and lining of the airways or tubes of the lungs. It narrows the airways and makes it difficult to breathe.
There are different degrees of asthma. Some children may have mild asthma with rare flare-ups. Others may have a severe, constant asthma.
Inflamed Bronchial Tube
© Nucleus Medical Media, Inc.
Last reviewedAugust 2014by Michael Woods, MD
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