The common clinical causes of increased airway resistance in children include inflammatory stimulation and allergic reactions. 1. Inflammatory stimulation: If inflammatory lesions occur in the airway, such as chronic asthmatic bronchitis, etc., the airway mucosa appears localized congestion, edema, inflammatory exudation, etc., which will block the airway, thus causing airway narrowing and increased airway resistance. 2. Allergic reaction: contact with inhalation allergens, such as willow, pollen, animal dander, etc., causing airway hyperreactivity, thereby inducing bronchial smooth muscle spasm, resulting in increased airway resistance. If there is an increase in airway resistance, it is recommended to go to the hospital in a timely manner, after clarifying the cause of the disease, standardized treatment, so as not to delay the condition.