Explanation
•Common triggers of an asthma attack include dust mites, animal dander, mold, perfumes, allergens, infections, stress, exercise, chemicals, and smoke.
•Asthma is a chronic, obstructive airway disease characterized by inflammation and constriction of the airway. It is caused by a spasm of the bronchial tubes or the swelling of the bronchial mucosa after exposure to various stimuli.