What is asthma? Asthma, Bronchial (Greek asthma,”panting”), respiratory disease in which spasm and constriction of the bronchial passages and swelling of their mucous lining cause obstruction of breathing, often due to allergy, particularly to dust, animal fur or feathers, moulds, and pollen.
Many people with allergic asthma, also called atopic or extrinsic asthma, also suffer from hay fever. Asthma in adults is less likely to be caused by allergy, and more likely to be associated with respiratory infections and emotional upsets. Non-allergic asthma is called intrinsic asthma.
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