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Underlying Cause
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Facts: - The most common cause of croup is respiratory syncytial virus (RSV), but influenza and cold viruses may also cause croup.
 - The infection causes irritation to the lining of the trachea, or windpipe. In response to the irritation, the lining of the trachea swells and produces mucus. This results in narrowing of the airway. Air whistles as it passes through the narrowed airway, which results in a barking cough and noisy breathing.
- Croup occurs in children, because a child's airway is much narrower than an adult's airway.
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Related Topics:
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