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Croup: Symptoms, Causes and Treatment
Croup is a common respiratory illness in young children marked by a barking cough, hoarseness, and breathing difficulties. It is usually caused by viral infections and resolves on its own.
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Croup is a common respiratory illness in young children marked by a barking cough, hoarseness, and breathing difficulties. It is usually caused by viral infections and resolves on its own.
What is Croup?
Croup (medically known as stenosing laryngotracheitis or pseudocroup) is an inflammatory condition affecting the larynx (voice box) and trachea (windpipe), primarily occurring in children aged six months to six years. The term distinguishes the condition from true croup caused by diphtheria, which has largely been eliminated through vaccination. Croup is most common in autumn and winter and often causes sudden, frightening symptoms at night.
Causes
Croup is almost always caused by viral infections. The most common pathogens include:
- Parainfluenza viruses (especially types 1 and 2) – the most frequent cause
- Respiratory syncytial virus (RSV)
- Influenza viruses
- Adenoviruses
- Measles virus (rare due to vaccination coverage)
These viruses inflame and swell the mucous membranes of the larynx and trachea, narrowing the airway and making breathing more difficult. In some children, allergic reactions or exposure to cold air can also trigger episodes.
Symptoms
Symptoms of croup typically appear suddenly, often in the middle of the night, and include:
- Barking cough – a distinctive, harsh cough resembling a seal barking
- Hoarseness – caused by swelling around the vocal cords
- Inspiratory stridor – a high-pitched, noisy sound when breathing in
- Breathing difficulty – ranging from mild to severe depending on the degree of airway narrowing
- Mild fever and runny nose as signs of a preceding respiratory infection
Symptoms tend to be milder during the day and worsen at night. Seek immediate medical attention if the child shows signs of severe breathing difficulty, bluish discoloration of the lips (cyanosis), or extreme agitation.
Severity Grades
Croup is classified into four severity grades:
- Grade 1: Barking cough, hoarseness, mild stridor when upset
- Grade 2: Stridor at rest, mild retractions of the chest muscles
- Grade 3: Marked breathing difficulty, agitation, pallor or cyanosis
- Grade 4: Exhaustion, severe respiratory distress – medical emergency
Diagnosis
Diagnosis is usually made clinically, based on the characteristic symptoms and physical examination. The barking cough and inspiratory stridor are typically sufficient for a diagnosis. In more severe or uncertain cases, the following assessments may be performed:
- Pulse oximetry (to measure blood oxygen levels)
- Neck X-ray (rarely needed; may show the classic “steeple sign” indicating subglottic narrowing)
- Laryngoscopy for direct visualization of the airway (in unclear cases)
Treatment
General Measures
Keeping the child calm is essential, as agitation and crying can worsen breathing difficulty. Cool, moist air – such as opening a window or going outside briefly – may provide some relief. Humidified air is often recommended, although scientific evidence for its benefit remains inconclusive.
Medical Treatment
- Corticosteroids (e.g., dexamethasone or budesonide) are the cornerstone of medical therapy. They rapidly reduce airway inflammation and swelling and can be administered orally, as a suppository, or via inhalation.
- Nebulized epinephrine (adrenaline) is used in moderate to severe cases to quickly dilate the airway and ease breathing.
- Antipyretic medications such as ibuprofen or paracetamol may be given to manage fever and discomfort.
When to Go to Hospital
Children with grade 3 or 4 croup, suspected bacterial superinfection, or those under six months of age should be admitted to hospital for close monitoring and, if necessary, intensive care support.
Prognosis and Course
Croup is in most cases a self-limiting illness that resolves without complications. Most children recover fully within three to seven days. Some children experience recurrent episodes during the toddler years, but as the airways grow larger with age, croup tends to become less frequent and eventually stops occurring altogether.
References
- Bjornson CL, Johnson DW. Croup in children. Canadian Medical Association Journal. 2013;185(15):1317–1323.
- Zoorob R, Sidani MA, Murray J. Croup: An Overview. American Family Physician. 2011;83(9):1067–1073.
- World Health Organization (WHO): Acute Respiratory Infections in Children. Available at: https://www.who.int
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