Asthma? is a chronic inflammatory disorder of the airways involving multiple inflammatory cells and inflammatory mediators. This chronic inflammation leads to airway hyperresponsiveness (AHR), and when exposed to multiple irritants, airway obstruction and airflow restriction occur, resulting in recurrent episodes of wheezing, shortness of breath, chest tightness, and coughing, which often flare up or worsen at night and/or early in the morning, with most children in remission with treatment or on their own. It is often not easily taken seriously by parents. Diagnostic criteria: 1. Recurrent episodes of wheezing, shortness of breath, chest tightness or cough, mostly related to exposure to allergens, cold air, physical or chemical stimuli, viral upper and lower respiratory tract infections, exercise, etc.; 2. Scattered or diffuse expiratory phase croup and prolonged expiratory phase can be heard in both lungs during episodes; 3. Bronchodilators have significant efficacy; 4. or cough.