Croup is a common respiratory problem in young children. It tends to occur in the fall and winter. Its main symptom is a harsh, barking cough. Croup causes swelling and narrowing in the voice box, windpipe, and breathing tubes that lead to the lungs. This can make it hard for your child to breathe.An attack of croup can be scary, but it is rarely serious.ymptoms of croup are caused by narrowed airways. They may include: 1  A barking cough. 2  The cough is often compared to the sound of a barking seal. 3  You'll know it when you hear it. 4  A raspy, hoarse voice. 5  A harsh, crowing noise when breathing in.
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