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in Colds & Fever QA
Why do we get a runny nose when sick?

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When you 're sick, it's because pathogens have gotten past the mucus lining. As mucus goes into overdrive, your mucus lining swells and your nasal cavity fills with excess fluid. This can drip out of the nose itself—a medical condition known as rhinorrhea, which the rest of us call a runny nose.
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