When a cold virus enters the body, it releases inflammatory mediators like histamine. This causes mucus glands to secrete fluid and blood vessels to dilate. The irritation of the mucous membranes of the nose and throat cause sneezing.
There is not much you can do to prevent sneezing. When your other symptoms go, your sneezing will stop too. You can treat sneezing with antihistamines. Over-the-counter medications for colds often contain antihistamines.
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