text: why do people say bless you when you sneeze?   some questions, no matter how simple, don't have one knowable answer. though a number of "explanations" exist for this custom, nothing points to any one of them being its origin.   common among these explanations are:    at one time people believed a man's soul could be inadvertently thrust from his body by an explosive sneeze, thus "bless you!" was a protective oath uttered to safeguard the temporarily expelled and vulnerable soul from being snatched up by satan (who was always lurking nearby). the purpose of the oath was to cast a temporary shield over the flung-out soul which would protect it just long enough to regain the protection of the corporeal body.   conversely, the sneeze itself was the expulsion of a demon or evil spirit which had taken up residence in a person. therefore, although the "bless you!" was again a protective charm meant to protect the sneezer from evil, in this version it was meant to ward off the re-entry of an evil spirit which a tormented soul had just rid itself of.   the heart was believed to momentarily stop during a sneeze (it doesn't), thus the "bless you!" was uttered either as a supplication for life to return or as a congratulation upon its successful restart.   others claim an association of the practice with particular dire diseases (most often the bubonic plague, or "black death," as it is sometimes known). they say an infected person's sneeze was sure sign he'd soon be pushing up daisies, thus the "bless you!" was intended as a benediction to the nearly-departed, a way of commending his soul to the care of god now that he was beyond the help of anything in the mortal world.   yet other folks echo the theme of other superstitions about sneezes, that these expulsions are either in themselves lucky or foretell good fortune coming the sneezer's way. for them, the "bless you!" is a recognition of incoming good luck, possibly even an attempt on the blesser's part to attract a bit of it to himself.   finally, some see the sneeze as a blessing bestowed by the sneezer upon the sneezed-upon. answering a sneeze with "bless you!" is seen as nothing more remarkable than replying "good morning!" to the person who had just greeted you with the same phrase.