There are various triggers of acute exacerbation of asthma. Bronchospasm and airway inflammation with edema and mucus production are key physiologic factors leading to clinical symptoms. β-Agonists and other bronchodilators target bronchospasm while corticosteroids reduce the inflammatory response by inhibiting the activation of inflammatory cells and by reducing mediator production, microvascular leakage, and mucus formation.There are various triggers of acute exacerbation of asthma. Bronchospasm and airway inflammation with edema and mucus production are key physiologic factors leading to clinical symptoms. β-Agonists and other bronchodilators target bronchospasm while corticosteroids reduce the inflammatory response by inhibiting the activation of inflammatory cells and by reducing mediator production, microvascular leakage, and mucus formation.