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How does croup occur?

Croup occurs when an infection with a virus causes inflammation and swelling of the voice box (larynx) and windpipe (trachea), making it harder to breathe. Under these conditions, taking a breath can cause the windpipe to collapse, narrowing the space available for air to enter the lungs. Air vibrates as it passes through the narrowed windpipe, causing the harsh, high-pitched noise (stridor) when breathing in.

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About this article

Author: Dr Joanne Van der Velden PhD, BSc (Hons)
First answered: 14 Oct 2014
Last reviewed: 19 May 2018
Rating: 4.1 out of 5
Votes: 419 (Click smiley face below to rate)
Category: Cough

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