Table II.

Causes of acute upper airway obstruction in adults.

Congential	Micrognathia Macroglossia
Infections	Retopharyngeal abcess Tuberculuous laryngitis Laryngopyocele Epiglottis
Traumatic	Intubation trauma Hematoma Facial fracture Laryngeal fracture Subglottic stenosis
Allergic/autoimmune	Rhinitis Sarcoidosis Wegener's disease Angioedema Asthma
Neoplastic	Nasopharyngeal carcinoma Epiglottis carcinoma Recurrent respiratory papillomatosis Haemangioma
Neurologic	Altered mental status Vocal fold paralysis Paralysis of respiratory muscles