1, etiology: 1, infection is the most common cause of the disease, the causative agents are influenza B b bacillus, staphylococcus, streptococcus, diplococcus pneumoniae, Neisseria pupillarum, diphtheria-like bacillus, etc., can also be mixed with viral infection. 2, allergic reactions systemic allergic reactions can also cause a high degree of edema in the epiglottis, aryepiglottic folds, secondary infection and morbidity. 3, trauma foreign body trauma, irritating harmful gas, irritating food, radiation damage, etc. can cause inflammatory lesions of the epididymal mucosa. 4.Acute inflammation of neighboring organs such as acute tonsillitis, pharyngitis, oropharyngitis, rhinitis, etc. can spread and invade the epiglottis. It can also be secondary to acute infectious diseases. The main symptoms are as follows: 1. Rapid onset, fever, chills, headache, general malaise, and in severe cases, respiratory distress. 2. Severe laryngeal pain, which is aggravated when swallowing, so there is often saliva spillage. 3. The swelling of the epiglottis causes slurred speech and seems to contain something in the mouth. Treatment: If the above symptoms appear, go to a regular hospital or specialist hospital for treatment as soon as possible.