Less than severe stridor can be auscultated over the larynx. Severe stridor can be heard without a stethoscope. Auscultation of lung sounds on the chest wall will be normal.
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Stridor is caused by upper airway narrowing or obstruction. It is often heard without a stethoscope. It occurs in 10-20% of extubated patients.

Stridor is a loud, high-pitched crowing breath sound heard during inspiration but may also occur throughout the respiratory cycle most notably as a patient worsens.

In children, stridor may become louder in the supine position.

Causes of stridor are pertussis, croup, epiglottis, aspirations.