Ausmed Explains... 1. Stridor: Stridor is a continuous, high-pitched, crowing sound heard predominantly on inspiration. The cause of this sound is generally the partial obstruction of the larynx or trachea. Stridor may be heard in conditions such as croup and foreign body obstruction. It’s typically loudest over the anterior neck, as air moves turbulently over a partially-obstructed, upper airway. 2. Wheeze: The sound of a wheeze is a high-pitched, continuous musical sound. This is caused by air