system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 whats happening when a sneeze ‘gets stuck’ then just burns your nose and makes your eyes water.
gpt
Sneezes are a protective response to alert you to less than ideal breathing conditions and remove irritants/allergens from your nose. They’re triggered by the presence of irritants, but only a certain concentration, which is mediated by multiple nerve endings that generate “spikes” when they’re irritated. Once the number of spikes passes a certain threshold, you sneeze. 

Sometimes your nose will be irritated to the point of feeling like you have to sneeze, but there isn’t quite enough to push you over the threshold. So you “get stuck.”