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One of the most common respiratory system disorders is asthma, a chronic inflammatory disease of the airways. It is characterized by episodes of wheezing, breathlessness, chest tightness, and coughing, particularly at night or early morning. The condition occurs due to hyperresponsiveness of the bronchial tubes, leading to narrowing of the airways. Asthma attacks are often triggered by allergens, dust, smoke, infections, exercise, ____ ______ __________ __________ ____ _________ _______ ________ ______ ________ ___ _____.
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