Nasal Flaring – Causes, Symptoms & Treatment
Nasal flaring refers to the visible widening of the nostrils during breathing and is a clinical sign of increased breathing effort or respiratory distress.
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Nasal flaring refers to the visible widening of the nostrils during breathing and is a clinical sign of increased breathing effort or respiratory distress.
What Is Nasal Flaring?
Nasal flaring is the visible, rhythmic widening of the nostrils (nasal alae) during inhalation. It is a clinical sign indicating increased work of breathing. In healthy adults at rest, this movement is barely noticeable. When clearly visible, it can signal respiratory distress (dyspnea) or a serious underlying condition affecting the airways or lungs.
Causes
Nasal flaring occurs when the body requires more oxygen or when the airways are partially obstructed. Common causes include:
- Respiratory infections: such as bronchitis, pneumonia, or croup
- Asthma: episodic narrowing of the airways causing breathing difficulty
- COPD: chronic obstructive pulmonary disease causing airflow limitation
- Heart failure: fluid accumulation in the lungs impairs gas exchange
- Anaphylaxis: severe allergic reaction with airway compromise
- Newborns and infants: nasal flaring is a key early warning sign of neonatal respiratory distress
- Physical exertion: intense exercise can cause transient nasal flaring without clinical significance
Symptoms and Clinical Significance
Nasal flaring often occurs alongside other signs of respiratory distress. The following accompanying symptoms may indicate a serious condition:
- Rapid breathing (tachypnea)
- Retractions of the skin between the ribs or at the neck (intercostal and supraclavicular retractions)
- Bluish discoloration of the lips or fingernails (cyanosis)
- Restlessness, anxiety, or altered consciousness
- Audible breathing sounds such as stridor or wheezing
In infants and young children, nasal flaring is a particularly important warning sign and always warrants immediate medical evaluation.
Diagnosis
Diagnosis is initially based on clinical observation. A healthcare provider assesses the work of breathing, measures blood oxygen saturation using pulse oximetry, and performs a physical examination. Depending on the suspected cause, further tests may include:
- Arterial blood gas analysis to assess oxygen and carbon dioxide levels
- Chest X-ray or CT scan
- Pulmonary function testing (spirometry)
- Laboratory tests such as complete blood count and inflammatory markers
Treatment
Treatment depends on the underlying cause of the nasal flaring:
- Supplemental oxygen: immediate administration via mask or nasal cannula in cases of hypoxia
- Bronchodilators: for asthma or COPD to open the airways (e.g., salbutamol)
- Antibiotics: for bacterial infections such as pneumonia
- Corticosteroids: to reduce airway inflammation in asthma or croup
- Emergency interventions: in cases of severe respiratory failure, mechanical ventilation may be required
Nasal flaring combined with other signs of severe respiratory distress is a medical emergency and requires immediate clinical attention.
References
- World Health Organization (WHO) - Integrated Management of Childhood Illness (IMCI) Guidelines, 2014.
- Lissauer, T. & Carroll, W. - Illustrated Textbook of Paediatrics. 5th Edition. Elsevier, 2018.
- Tintinalli, J.E. et al. - Tintinalli's Emergency Medicine: A Comprehensive Study Guide. 9th Edition. McGraw-Hill, 2020.
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