Stridor

A harsh, high-pitched, inspiratory wheezing sound produced by turbulent airflow through a critically narrowed upper airway, typically at the level of the larynx or trachea. Possible causes in children are croup (laryngotracheobronchitis), laryngomalacia, foreign body aspiration, and epiglottitis. Possible causes in adults are vocal cord paralysis, airway edema (anaphylaxis, smoke inhalation, trauma to the throat), tumors, complications after surgery and prolonged intubation.