This is a symptom complex associated with a functional or organic impairment of bronchial patency. The term "Bronchoobstructive Syndrome" cannot be used as an independent diagnosis!!! In all cases of bronchial obstruction, the nosological form of the disease should be established. The frequency of the development of bronchoobstructive syndrome against the background of ARVI ranges from 5% to 50%. In children with a family history burdened with allergies, bronchoobstructive syndrome develops in 30-50% of cases