Do you really know? Why does our nose run when I'm sick?
Dec 14, 2025
Feeling under the weather? Discover why your nose runs when you're sick! Mucus plays a key role in trapping pathogens and keeping you healthy. Did you know that extra mucus production signals your immune response kicking in? Learn how the color of your mucus can indicate the stage of an infection. Plus, get tips on how to manage a runny nose effectively, including hydration and steam remedies. It’s a quick deep dive into the science behind sniffles!
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Mucus Is A Defensive Filter
- Mucus (snot) lines the nose, throat, lungs, and eyes and traps harmful microbes and particles.
- The body increases mucus production when sick to flush out germs and protect deeper airways.
What Mucus Is Made Of
- Mucus is made from water, proteins, and salts and uses its sticky consistency to trap dust, pet dander, and mildew.
- The body then increases mucus production to expel trapped bacteria and other invaders.
Mucus Changes Reflect Immune Action
- Mucus chemistry actively interferes with pathogens by preventing bacteria from clustering and becoming more dangerous.
- Colour changes (clear → green → clear) reflect immune cell activity during infection and recovery.