Why do you sneeze after stepping out of a cool, air-conditioned room into the sunlit outdoors?

Question

Why do you sneeze after stepping out of a cool, air-conditioned room into the sunlit outdoors?

In: Biology

Answer 1

Sudden bright light induces ‘squinting’ to protect the eyes, which are the same facial muscles tied into the sinuses.
The sudden pressure difference can tickle the nose and cause sneezing.