Croup | Overview

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.