| Extrathoracic upper airway obstruction | | Postnasal drip syndrome | | Paroxysmal vocal cord motion | | Hypertrophied tonsils | | Supraglottitis | | Laryngeal edema | | Laryngostenosis | | Postextubation granuloma | | Retropharyngeal abscess | | Benign airway tumors | | Anaphylaxis | | Malignancy | | Obesity | | Klebsiella rhinoscleroma | | Mobile supraglottic soft tissue | | Relapsing polychondritis | | Laryngocele | | Abnormal arytenoid movement | | Vocal cord hematoma | | Bilateral vocal cord paralysis | | Cricoarytenoid arthritis | | Granulomatosis with polyangiitis (Wegener's) | | | Intrathoracic upper airway obstruction | | Tracheal stenosis | | Foreign body aspiration | | Benign airway tumors | | Malignancies | | Intrathoracic goiter | | Tracheobronchomegaly | | Acquired tracheomalacia | | Herpetic tracheobronchitis | | Right-sided aortic arch | | | Lower airway obstruction | | Asthma | | Chronic obstructive pulmonary disease | | Pulmonary edema | | Aspiration | | Pulmonary embolism | | Bronchiolitis | | Cystic fibrosis | | Carcinoid syndrome | | Bronchiectasis | | Lymphangitic carcinomatosis | | Parasitic infections | |
