Acute epiglottitis causes sudden upper airway obstruction that may become lethal, and must be diagnosed and treated quickly and precisely. We review clinical features of 71-cases of acute epiglottitis in 6 years, focusing in cases requiring emergency airway management. Retrospective analysis was done for 1) age and gender, 2) month of onset, 3) symptoms, 4) smoking history, 5) diabetes history, 6) cause and background, 7) first medical institution visit, 8) duration from symptom onset to hospital visit, 9) oropharyngeal findings, 10) laryngendoscopic findings, 11) pharyngeal culture, and 12) deterioration after hospitalization. We found that 2 cases deteriorated in laryngendoscopic findings after hospitalization despite treatment. Even if the first medical findings are mild, it is necessary to respond to patients with the possibility to deterioration in mind. Five cases required emergency airway management-3 with tracheostomy and 2 cases with endotracheal intubation. If symptoms of laryngeal edema, oxygen desaturation, and dyspnea are present, emergency airway management should be prepared soon after hospitalization.