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Wheezing

What are wheezing and bronchoconstriction?

Wheezing is a whistling noise made during breathing. It occurs when the small airways, or bronchial tubes, that lead to your lungs swell or contract (spasm) and become narrow. This narrowing is called bronchoconstriction. When your airways constrict, it is hard for air to pass through and this makes it hard for you to breathe.