Clinical experience of Shegan Mahuang decoction in treating cough variant asthma in children

Cough variant asthma (CVA) in children primarily involves the lungs but is closely related to the heart, liver, spleen, and kidneys. The pathological factors are mainly wind, cold, and phlegm, with the fundamental pathogenesis characterized by yang deficiency. Persistent cold, hardened phlegm, and internal stagnation are often the underlying conditions. Clinically, the disease commonly presents as cold-fluid stagnation in the lungs, phlegm obstruction due to yang deficiency, and stubborn phlegm retention in the lungs. The primary treatment approach is using Shegan Mahuang Decoction to warm yang and dissolve retained fluid. A case study is attached as supporting evidence.