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2. Inflammatory Responses

Triggers cause an inflammatory response, the immune system’s way of protecting the body from harmful substances. Irritants that enter the bronchial tubes result in inflammation that narrows these tubes and makes it harder to breathe. Bronchospasms occur when muscles on the walls of the bronchial tubes contract, constricting the airway and making it hard to breathe.

Woman having trouble breathing AntonioGuillem / Getty Images
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