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    Breath sounds

    Lung 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
    • Rhonchi
    • Stridor
    • Wheezing

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

    When to Contact a Medical Professional

    Nasal flaring and cyanosis are emergency symptoms. Difficulty breathing or shortness of breath can be an emergency condition. Seek immediate medical care if you have any of these symptoms.

    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:

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


    • What causes wheezing?


    • Lungs


    • Breath sounds


    • What causes wheezing?


    • Lungs


    • Breath sounds


    A Closer Look

      Talking to your MD

        Self Care

          Tests for Breath sounds

            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.

            The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.

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            St. Luke's Hospital - 232 South Woods Mill Road - Chesterfield, MO 63017 Main Number: 314-434-1500 Emergency Dept: 314-205-6990 Patient Billing: 888-924-9200
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