Overeating
While overeating might result in a stomachache for some, it makes a few people sneeze. This sensation is due to a response that researches jokingly call the snatiation reflex. “Satiated” means you feel full; combine that with “sneeze,” and you get “snatiation.”
The name has stuck because the phenomenon is real—the feeling of fullness can set off uncontrolled sneezing fits in some people.