Science
How does a sneeze work?
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.
See it in motion.
Watch a 2-minute animated lesson that shows exactly how a sneeze works.
Step by step
- 1Irritants in the nose trigger nerve signals.
- 2The brain coordinates a sudden, forceful exhale.
- 3Air rushes out the nose and mouth at high speed.
- 4It clears irritants like dust, pollen, and germs.
- 5It's a protective reflex you can't easily stop.
Frequently asked questions
- 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.