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Print: What is croup?
Croup is an infection usually caused by a virus. It causes the trachea (windpipe) and larynx (voice box) to swell, which results in the harsh "barking" cough. Croup usually lasts 5 to 6 days and is more common during the winter months and early spring.
Children who are 5 years old or younger are more likely to have croup. If your child was born prematurely, he or she is also at higher risk of getting croup.
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Written by familydoctor.org editorial staff
Reviewed/Updated: 02/10
Created: 09/00
