Common causes of acute epiglottitis include bacterial or viral infections and allergic stimuli. When the mucous membrane of the pharyngeal cavity is infected by bacteria or viruses, the inflammation may spread to the epiglottis and cause acute epiglottitis. Allergic substances that stimulate the pharynx can also lead to allergic reactions, and acute epiglottitis needs to be treated in a timely manner in order to avoid aggravation of the symptoms and endangerment of the patient’s life. 1. Bacterial or viral infection: Acute epiglottitis is usually caused by bacterial or viral infection, which will invade the mucous membrane of the pharyngeal cavity and its neighboring tissues, causing other acute inflammation of the pharynx such as acute tonsillitis, stomatitis and acute epiglottitis. 2. Allergic stimulation: some patients will lead to type I allergic reaction (refers to the reaction caused by the body when it encounters the same allergic substances) after contacting drugs or allergic substances, such as animal dander dust mite, etc. This kind of patients will have a rapid onset. The onset of the disease can be rapid, and patients may experience difficulty in swallowing and breathing, which may lead to life-threatening asphyxiation in severe cases. In addition, trauma can also lead to swelling and congestion of the epiglottis. It is recommended to consult a doctor for a clear diagnosis and standardized treatment after examination by a specialist.