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How does a sneeze work?
Quick answer
A sneeze works as a forceful, automatic burst of air that clears irritants from your nose. When something tickles the nasal lining, nerves trigger a powerful reflex that blasts air out to eject dust, germs, or pollen. Irritants in the nose trigger nerve signals.
Step by step
- Irritants in the nose trigger nerve signals.
- The brain coordinates a sudden, forceful exhale.
- Air rushes out the nose and mouth at high speed.
- It clears irritants like dust, pollen, and germs.
- It's a protective reflex you can't easily stop.
People also ask
Why do we sneeze?
To forcefully expel irritants — dust, pollen, germs — from the nose, protecting the airways from things that don't belong there.
Why can't you sneeze with your eyes open?
It's a reflex that briefly closes the eyes; you can sometimes override it, but the body links the two automatically.
Why do some people sneeze in bright light?
About a quarter of people have a 'photic sneeze reflex,' where sudden bright light triggers a sneeze, likely from crossed nerve signals.
Part of the guide: How Your Body Works →