Nose and pharynx Congenital anomalies Lingual thyroid Choanal atresia Craniofacial anomalies (Apert and Down syndromes; Pierre Robin sequence) Cysts (dermoid, thyroglossal) Macroglossia (Beckwith syndrome) Encephalocele Inflammatory Abscess (parapharyngeal, retropharyngeal, peritonsillar) Allergic polyps Adenotonsillar enlargement (acute infection, infectious mononucleosis) Neoplasm (benign, malignant) Adenotonsillar hyperplasia Foreign body Neurologic syndromes with poor tongue/pharyngeal muscle tone Larynx Congenital anomalies Laryngomalacia Web, cyst, laryngocele Cartilage dystrophy Subglottic stenosis Cleft larynx Inflammatory Croup Epiglottitis/Supraglottitis Tracheitis Anaphylaxis Angioneurotic edema Miscellaneous: tuberculosis, fungal infection, diphtheria, sarcoidosis Vocal cord paralysis (multiple causes) Psychogenic stridor (vocal cord dysfunction) Neoplasm Subglottic hemangioma