Subvocal stenosis includes mucosal edema caused by acute laryngitis, tracheitis and stimulation of adverse physical and chemical factors, and can also be caused by hyperplasia of lesions triggered by specific infections, and can also be caused by scar contracture after traumatic injuries, which need to be treated according to different etiologies and degrees of disease, including: drug treatment, surgical treatment, etc. 1. Drug treatment: acute edema caused by respiratory inflammation, can be applied to cephalosporin antibiotics, such as ceftriaxone, cefradine, etc.; glucocorticoid therapy, such as dexamethasone, budesonide, prednisone and so on. 2. Surgical treatment: children with choking and obvious dyspnea should be fed with nasal diet, and tracheotomy should be performed as early as possible to ensure the airway is open and avoid asphyxiation. After the acute symptoms are controlled, the laryngotracheal framework can be expanded with its own cartilage grafts or allogeneic stents to expand the ventilation area and relieve the dyspnea. Repeated surgeries are often required if the symptoms are caused by laryngeal papilloma. Subglottic stenosis symptoms should be treated with standardized medication and therapy after examination and evaluation by a specialist.