system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: when I feel like I'm about to sneeze, but then I don't, what happened?
gpt
Usually a person sneezes due to irritation in the nose, mucus, hair or any irritants that the body (or the nose) wants to expel explosively (hence the sneeze).

But as the body is preparing to sneeze, you are inhaling air, inflating your lungs and in general doing the "aah..aaaaahhh..." part, if the irritant is moved or is dislodged from it's place - the need and the urge to sneeze vanishes. Hence no sneeze.

tl;dr: the preparation to fight the enemy causes the enemy to go away.