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…showed last 75 words of 515 total…bronchial tubes is irritated by triggers, which cause the lining to become swollen and inflamed. Strenuous physical activity can cause an asthma attack, especially when breathing through the mouth in cold, dry air, or prolonged activities like medium- to long-distance (AAAAI). An allergen is "any substance that triggers allergies." This includes pollens, animal dander, molds, house dust mites, and cockroach droppings. Most people who have both allergies and Asthma have asthma symptoms upset by allergens.