Vocal edema refers to edema, erosion, and submucosal hemorrhage of the vocal mucosa. 1. The lining of the digestive, respiratory, excretory, and reproductive organs in vertebrates is kept moist by mucus, so they are mostly called mucous membranes. 2.Mucosa is the moist lining of the oral cavity, nasal cavity, intestinal canal, vagina, intestinal tract, and other body cavities that are connected to the outside world). Bleeding. Mostly caused by external factors. Mostly caused by external factors. Generally common symptoms are babies born with loud breathing but normal crying. The degree of respiratory distress depends on the obstruction. What are the causes of vocal edema? 1, traumatic asphyxia: traumatic asphyxia caused by severe chest crush injuries, the incidence of about 2% to 8% of chest injuries. In the chest squeeze instantaneous injured vocal door suddenly closed, the airway and lung air can not overflow, and the pressure in the thoracic cavity suddenly rose, forcing the venous blood flow squeezed back to the upper body, causing the head, shoulder, upper chest tissue capillary rupture, blood overflow, resulting in punctate bleeding. 2, pharyngeal burns: pharynx for swallowing and breathing must pass through, pharyngeal burns mostly involve the larynx at the same time, into the esophagus then appear esophageal burns, in addition to local symptoms, but also can cause systemic complex pathological changes and toxic symptoms, should be early diagnosis, timely treatment. 3.Pharyngeal trauma: pharyngeal trauma is mostly caused by foreign body injury, medical injury, chemical corrosion and burns, which can occur alone or often accompanied by oral or laryngeal cervical esophageal injury. 4, congenital subglottic stenosis: normal infants and children subglottic cavity diameter is 5.5 ~ 6mm, due to abnormal development, subglottic cavity narrowing resulting in obstruction, called congenital subglottic stenosis, for the subglottic cavity wall of one or both sides of the obstruction, mostly elastic cone lesions, but also due to cricoid cartilage malformation. 5, inhalation injury: inhalation injury refers to the inhalation of toxic fumes or chemical substances to the respiratory tract caused by chemical injury, serious cases can be directly damaged lung parenchyma. It occurs mostly in large areas, especially with head and facial burns patients.