system
Given the following post, respond as if you're commenting on Reddit:
human
What is that feeling we get when we want to sneeze but can't. What exactly is going on in our noses at that time?
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 its 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.