Signs and Symptoms

Croup is characterized by a loud cough that may sound like the barking of a seal and may be accompanied by fast or difficult breathing and sometimes a grunting noise or wheezing while breathing.

At first, a child may have cold symptoms like a stuffy or runny nose for a few days and may also have fever. As the upper airway (the lining of the windpipe and the voice box) becomes progressively inflamed and swollen, the child may become hoarse, with a harsh, barking cough.

If the upper airway becomes swollen to the point where it is partially blocked off, it becomes even more difficult for a child to breathe. This happens with severe croup. With severe croup, there may be a high-pitched or squeaking noise when breathing in (this is called stridor). A child will tend to breathe very fast, and the stomach or the skin between the child's ribs may seem to pull in during breathing. The child may also appear pale or bluish around the mouth because he is not getting enough oxygen.

Symptoms of croup often worsen at night and when the child is upset or crying. In addition to the effects on the upper airway, the infections that cause croup can result in inflammation further down the airway, including the bronchi (breathing tubes) and the lungs.