Breath soundsLung sounds; Breathing sounds
Breath sounds are the noises produced by the structures of the lungs during breathing.
The lung sounds are best heard with a stethoscope. This is called auscultation.
Normal lung sounds occur in all parts of the chest area, including above the collarbones and at the bottom of the rib cage.
Using a stethoscope, the doctor may hear normal breathing sounds, decreased or absent breath sounds, and abnormal breath sounds.
Absent or decreased sounds can mean:
- Air or fluid in or around the lungs (such as pneumonia, heart failure, and pleural effusion)
- Increased thickness of the chest wall
- Over-inflation of a part of the lungs (emphysema can cause this)
- Reduced airflow to part of the lungs
There are several types of abnormal breath sounds. The four most common are:
Rales are small clicking, bubbling, or rattling sounds in the lungs. They are believed to occur when air opens closed air spaces. Rales can be further described as moist, dry, fine, and course.
Rhonchi are sounds that resemble snoring. They occur when air is blocked or becomes rough through the large airways.
Wheezes are high-pitched sounds produced by narrowed airways. They can be heard when a person breathes out (exhales). Wheezing and other abnormal sounds can sometimes be heard without a stethoscope.
Stridor is a wheeze-like sound heard when a person breathes. Usually it is due to a blockage of airflow in the windpipe (trachea) or in the back of the throat.
- Acute bronchitis
- Chronic bronchitis
- Interstitial lung disease
- Foreign body obstruction of the airway
- Pulmonary edema
When to Contact a Medical Professional
Contact your health care provider if you have wheezing or other abnormal breathing sounds.
Your health care provider will do a physical exam and ask you questions about your medical history and your breathing.
Questions may include:
- When did the breathing sound start?
- How long did it last?
- How would you describe your breathing?
- What makes it better or worse?
- What other symptoms do you have?
The health care provider usually discovers abnormal breath sounds. You may not even notice them.
The following tests may be done:
What causes wheezing?
Lungs - illustration
Breath sounds - illustration
Review Date: 6/8/2011
Reviewed By: Andrew Schriber, MD, FCCP, Specialist in Pulmonary, Critical Care, and Sleep Medicine, Virtua Memorial Hospital, Mount Holly, New Jersey. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.