chapter  5000
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Non-Laryngeal Aerodigestive Disorders Affecting Voice

Essential features. Asthma is a respiratory disease characterized by increased responsiveness of the tracheal and bronchial lining to various stimuli. The characteristic physiologic response includes airway narrowing, and wheezing on exhalation. Three types of asthma are identified: (a) extrinsic or allergic asthma, caused by an allergic response; (b) intrinsic or non-allergic asthma, caused by recurring bronchial, sinus, tonsillar, or adenoid infections or bronchial hypersensitivity, due to but not limited to exercise or temperature change; and (c) mixed extrinsic (allergic) and intrinsic (non-allergic) asthma. These conditions may interact.