/ Math & Science / Health / Water-Borne Diseases: Cholera and Dysentery: Cholera: Scourge of the Poor / Why do we sneeze? Cite Why do we sneeze? Updated February 21, 2017 | Factmonster Staff We sneeze to clear our breathing passages. We all have a natural reflex to sneeze whenever a small foreign substance enters our airways. So don’t hold back your sneezes-let ‘em rip! What happens when my foot falls asleep? Q&A about the Body See also: Why do people sleep?