Differential diagnoses of stridor in children under 5 years
| Acute | Chronic |
| Laryngotracheobronchitis (croup) | Laryngomalacia |
| Aspiration of foreign body | Subglottic stenosis |
| Anaphylaxis | Vocal cord dysfunction |
| Retropharyngeal/peritonsillar abscess | Congenital malformations of the larynx |
| Bacterial tracheitis | Laryngeal haemangiomas |
| Epiglottitis | Tracheomalacia |
| Tracheal stenosis | |
| Laryngeal papillomas | |
| Hypocalcaemia |