Stridor is a high pitched sound resulting from turbulent air flow in the upper airway. [https://orcid.org/0000-0002-0736-9199, pmid:26229557]

Stridor (from Latin 'creaking/grating noise') is an extra-thoracic high-pitched breath sound resulting from turbulent air flow in the larynx or lower in the bronchial tree. It is different from a stertor, which is a noise originating in the pharynx. Stridor is a physical sign which is caused by a narrowed or obstructed airway...