Answer
Asthma is a disease of airway inflammation generated by sensitivity to certain substances or activities. These are referred to as triggers. Different asthmatics are sensitive to different triggers. Common triggers include viral infections, dust, tobacco smoke, cold air, pollens, exercise, animal dander, emotional states, odors, gastroesophageal reflux. When the airways are exposed to these triggers, they generate inflammation and irritation and bronchospasm.
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