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Types of breath sounds Your doctor will use a medical instrument called a stethoscope to listen for normal breath sounds. A normal breath sound is similar to the sound of air. Your doctor can hear normal breath sounds by placing the stethoscope on your: • chest • back • collarbone • rib cage Your doctor can also use a stethoscope to hear abnormal breathing sounds, which may include: • rhonchi, which are low-pitched sounds • crackles, which are •, which is a high-pitched whistling sound caused by narrowing of the bronchial tubes •, which is a harsh, vibratory sound caused by narrowing of the trachea. What are the causes of abnormal breath sounds?

Abnormal breath sounds are usually indicators of problems in the lungs or airways. The most common causes of abnormal breath sounds are: • • • chronic obstructive pulmonary disease, such as emphysema • asthma • • a foreign body in the lungs or airways If the small air sacs in the lungs fill with fluid, any air movement in the sacs, such as when you’re breathing, causes crackles. The air sacs will fill with fluid when a person has pneumonia or heart failure. Rhonchi occur when air tries to pass through bronchial tubes that contain fluid or mucus. Wheezing occurs when the bronchial tubes become inflamed and narrowed. Stridor occurs when the trachea narrows. When are breath sounds a medical emergency?