Originally posted by PapaBear.OR
How come when people sneeze, we say "bless you"? Hey, I think I know the answer to this. A person in medicine told me this while working last week so here goes:
"Bless you" comes from the old days when the plague was common. When you started to sneeze that was often times the first sign that you were getting the plague, so people would say bless you in hopes of ridding the disease. It just kept carrying on 'til modern days
There's tons of speculation on this one though
http://en.wikipedia.org/wiki/God_bless_you