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Nasal flaring

Nasal flaring occurs when the nostrils widen while breathing. It is often a sign of trouble breathing.

Considerations

Nasal flaring is seen mostly in infants and younger children.

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

In young infants, nasal flaring can be a sign of respiratory distress. This is a serious lung condition that prevents enough oxygen from getting to the lungs and into the blood.

Causes

Nasal flaring may be caused by any of the following:

Home Care

Seek emergency help right away 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. It 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 provider will perform a physical exam and ask about the symptoms and medical history. Questions may include:

  • 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?

The provider will listen carefully to the breath sounds. This is called auscultation.

Tests that may be done include:

Oxygen may be given if there is a breathing problem.

Alternative Names

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

References

Roosevelt GE. Acute inflammatory upper airway obstruction (croup, epiglottitis, laryngitis, and bacterial tracheitis). In: Kliegman RM, Stanton BF, St. Geme JW, Schor NF, eds. Nelson Textbook of Pediatrics. 20th ed. Philadelphia, PA: Elsevier; 2016:chap 385.

Sarnaik AP, Clark JA, Sarnaik AA. Respiratory distress and failure. In: Kliegman RM, Stanton BF, St. Geme JW, Schor NF, eds. Nelson Textbook of Pediatrics. 20th ed. Philadelphia, PA: Elsevier; 2016:chap 71.

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Review Date 5/18/2016

Updated by: Neil K. Kaneshiro, MD, MHA, Clinical Assistant Professor of Pediatrics, University of Washington School of Medicine, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.

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