Asthma is a long-lasting inflammatory lung disease, characterized by constriction of the airways in the lungs, swelling of the lining of the bronchial tubes in the lungs, and secretion of excessive amounts of thick mucus. This inflammation is activated by irritants or allergens, called triggers. This inflammation may cause difficulty breathing, shortness of breath, wheezing and coughing. Sometimes symptoms are severe enough to warrant treatment in an emergency room. Asthma usually begins in chil...
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