What type of lung sound is produced by inflammation in the upper airways?

Stridor is a high-pitched, wheezing sound caused by disrupted airflow, particularly during inhalation, due to an obstruction or inflammation in the upper airways, such as the trachea or larynx. This sound indicates that there is a narrowing or blockage that is impeding airflow and is typically associated with conditions like croup, epiglottitis, or anaphylaxis.

The presence of stridor is significant as it often indicates a more severe underlying issue that requires prompt medical attention. In contrast, sounds such as wheezing, crackles, or rhonchi are more commonly associated with conditions affecting the lower airways or lung tissue. Therefore, the identification of stridor specifically points to upper airway involvement, making it the correct choice in this context.