Situation before

[Dr.Appalayya]

If some external matter goes into nose, one sneezes.

How to describe what happens to nose or nostrils before one sneezes?

 

[Thomas1]

Perhaps, one sniffs, sniffles or inhales something that makes them sneeze?

Tom

 

[clairanne]

hi

Your nose will tingle or itch maybe?

 

[Thomas1]

How about: the smell/smoke/etc. tickled my nose?

Tom

 

[Alxmrphi]

Sniffles implies having a cold, I think sniffs is a safe bet.