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    Nasal flaring

    Flaring of the alae nasi (nostrils); Nostrils - flaring

    Nasal flaring is when the nostrils widen when you breathe.It is often a sign that is it difficultto breathe.


    Nasal flaring is seen mostly in infants and younger children.

    Any condition that causes difficulty breathing can cause nasal flaring. While many causes of nasal flaring are not serious, some can be life threatening.

    In young infants, nasal flaring can be a very important symptom of respiratory distress.


    • Asthma (acute)
    • Airway obstruction (any cause)
    • Bronchiolitis
    • Croup
    • Epiglottitis (acute)
    • Pneumonia
    • Transient tachypnea of the newborn

    Home Care

    Seek immediate emergency help if you or your child has signs of a breathing difficulty.

    When to Contact a Medical Professional

    Call your health care provider if:

    • There is any persistent, unexplained nasal flaring, especially in a young child.
    • Bluish color develops in the lips, nail beds, or skin. This is a sign that breathing difficulty is severe and may mean that an emergency condition is developing.
    • You think that your child is having trouble breathing.

    What to Expect at Your Office Visit

    The doctor or nurse will perform a physical exam and ask questions about the symptoms and medical history, such:

    • When did the symptoms start?
    • Are they getting better or worse?
    • Is the breathing noisy, or are there wheezing sounds?
    • What other symptoms are there, such as sweating or feeling tired?
    • Do the muscles of the stomach, shoulders, or rib cage pull inward during breathing? (See: intercostal retractions)

    The doctor or nurse will listen carefully tothe breath sounds. This is called auscultation.

    Tests that may be done include:

    • Arterial blood gas analysis
    • Complete blood count (CBC)
    • ECG
    • Pulse oximetry to measure blood oxygen level
    • X-rays of the chest

    Oxygen may be given if there is a breathing problem.


    Wiebe RA, Scott SM. General approach to the pediatric patient. In: Marx J, ed. Rosen’s Emergency Medicine: Concepts and Clinical Practice. 7th ed. St. Louis, Mo: Mosby; 2011:chap. 164.


    • Nasal flaring


    • Sense of smell


      • Nasal flaring


      • Sense of smell


      A Closer Look

        Talking to your MD

          Self Care

            Tests for Nasal flaring

              Review Date: 5/16/2012

              Reviewed By: Neil K. Kaneshiro, MD, MHA, Clinical Assistant Professor of Pediatrics, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M. Health Solutions, Ebix, 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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