Causes of Laryngeal Edema Laryngeal edema is an infiltration of tissue fluid under the mucous membrane in the laxity of the larynx. There are two main categories of causes: infectious and non-infectious. Laryngeal edema is often accompanied by laryngeal pain, hoarseness, laryngeal stridor and dyspnea, and may be accompanied by fever and chills, sore throat, laryngoscopy reveals the mucous membrane to be crimson edema, the surface of the shiny, stridor, hoarseness, dyspnea, or even asphyxia, and laryngoscopy reveals the laryngeal mucous membrane to be diffusely edematous and pale. Acute laryngitis is an acute catarrhal inflammation of the laryngeal mucosa, often secondary to acute rhinitis, sinusitis, acute pharyngitis, as part of the entire upper respiratory tract infection, or can occur alone. Acute laryngitis can also be caused by shouting, excessive use of the voice, and violent coughing. If it occurs in children, it is more serious. Acute epiglottitis is an acute inflammatory lesion of the epiglottis mucosa, which often leads to abscess formation when not treated. The occurrence of these symptoms can cause laryngeal edema, which can be life-threatening if not treated in time. Other common causes 1, anterior cervical surgery causes postoperative dyspnea: (1) intraoperative trachea, esophagus caused by pulling pharyngeal edema; (2) the neck of the operation area hematoma compression of the trachea; (3) pharyngeal pain, neck braking affects the respiratory secretion discharge; (4) surgical stimulation of the spinal cord can be made to the spinal cord edema or spinal nerve root edema, resulting in paralysis of respiratory muscles, resulting in central respiratory distress. (2) After pediatric cardiac surgery, laryngeal edema and laryngeal obstruction are likely to occur after tracheal intubation. The fragile myocardium is poorly tolerant to hypoxia, and hypoxic damage of the myocardium and cardiac arrest are very likely to occur. Due to the characteristics of narrow laryngeal cavity and loose post-mucosal tissues in pediatrics, acute laryngeal edema is a life-threatening emergency in pediatrics.