Why do airways become narrow in asthma?

If you have asthma, it means that your airways are more irritable or twitchy than normal. When you come into contact with a trigger factor, the result is a narrowing of airways. Most of these triggers also lead to an inflammation in the airways…which is a swelling of the lining membrane along with collection of certain cells and excessive production of mucous. There is also a contraction of the muscle that surrounds the airways. Due to inflammation and smooth muscle narrowing, the passage of the airways becomes narrower and breathing becomes difficult.

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