Wheezing is a high-pitched whistling sound made while you breathe. It’s heard most clearly when you exhale, but in severe cases, it can be heard when you inhale. It’s caused by narrowed airways or inflammation.
Wheezing or breathing noisily is a sign that something could be blocking the airways in the lungs or something’s making them too narrow.
Wheezing may be a symptom of a serious breathing problem that requires diagnosis and treatment.