MedlinePlus Medical Encyclopedia: Breath sounds

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Breath sounds

Contents of this page:
Illustrations Alternative names Definition Considerations	Common Causes Home Care Call your health care provider if What to expect at your health care provider's office

Illustrations

Lungs

Breath sounds

Alternative names Return to top

Lung sounds; Breathing sounds

Definition Return to top

Breath sounds are the sounds produced by the structures of the lungs during breathing.

Considerations Return to top

The lung sounds are usually examined by auscultation (listening) with a stethoscope.

Normal lung sounds occur in all parts of the chest area, including above the collarbones and at the bottom of the rib cage. Auscultation may find normal breath sounds, decreased or absent breath sounds, and abnormal breath sounds.

Absent or decreased sounds reflect reduced airflow to a portion of the lungs, over-inflation of a portion of the lungs (such as with emphysema), air or fluid around the lungs, or increased thickness of the chest wall.

There are several types of abnormal breath sounds: rales, rhonchi, and wheezes are the most common. Wheezing can sometimes be heard without a stethoscope, and other abnormal sounds are sometimes also loud enough to be detected with the unaided ear.

Rales (crackles or crepitations) are small clicking, bubbling, or rattling sounds in the lung. They are believed to occur when air opens closed alveoli (air spaces). Rales may be further described as moist, dry, fine, and coarse.

Rhonchi are sounds that resemble snoring. They are produced when air movement through the large airways is obstructed or turbulent.

Wheezes are high-pitched, musical sounds produced by narrowed airways, often occurring during expiration (breathing out).

Common Causes Return to top

Foreign body obstruction of the airway
Emphysema
Asthma
Pulmonary edema
Bronchiectasis
Chronic bronchitis
Acute bronchitis
Interstitial lung disease
Pneumonia
Tracheobronchitis

Note: See also wheezing.

Home Care Return to top

Health care measures that can be employed at home depend on the disease causing any abnormal breath sounds. Consult with your health care provider.

Call your health care provider if Return to top

Difficulty breathing or shortness of breath -- a potential emergency condition!
Use of accessory muscles or other signs of increased breathing work such as retractions, nasal flaring, and cyanosis -- this is an emergency symptom!
Wheezing or other abnormal sounds, persistent or noticed for the first time

What to expect at your health care provider's office Return to top

The medical history will be obtained and a physical examination performed.

Medical history questions documenting an abnormal lung sound in detail may include:

Time pattern
- When did it start?
- How long did it last?
- Is there a pattern to the occurrences?
Quality
- How would you describe it?
Relieving factors
- What makes it better?
Aggravating factors
- What makes it worse?
Other
- What other symptoms are also present?
- Is there any coughing?
- Is there any difficulty breathing?

Note: Abnormal breath sounds are usually discovered by the health care provider, and the affected person may or may not have been aware of its presence.

The physical examination will include careful assessment of the lungs and breathing.

Diagnostic tests that may be performed include:

Chest x-ray
Pulmonary function tests
Blood tests (including an arterial blood gas)
CAT scan of the chest
Analysis of a sputum sample (sputum culture, sputum gram stain)

Interventions:
Treatment will depend on the disease that is causing the abnormal breath sounds.

After seeing your health care provider:
You may want to add a diagnosis related to abnormal breath sounds to your personal medical record.

Update Date: 1/27/2004

Updated by: Allen J. Blaivas, D.O., Division of Pulmonary, Critical Care, and Sleep Medicine, University Hospital, Newark, NJ. Review provided by VeriMed Healthcare Network.

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed physician should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. Copyright 2002 A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.