Breathing sound that is high-pitched and tight A purring or whistling sound You can hear it best when your child is breathing out Use this guide only if your child has not been diagnosed with asthma ...

A narrowing of the smallest airways in the lung (bronchioles) causes wheezing. This narrowing results from swelling caused by a virus. The respiratory syncytial virus (RSV) causes most bronchiolitis.

Postnasal drip occurs when mucus from your nasal passages drips down the back of your throat. The symptoms of postnasal drip include coughing and frequent throat clearing, a sore or scratchy throat, ...