Harmy52 is right... while there was an attempt to interject some humor based on my recent illness, the main point was to bring up how traumatic to the body shouting must be. There was no "off topic" forum so I figured general was the best place to post.
While ther isn't a strictly off-topic forum for Skyrim, most off-topic threads go to the Community Discussion: http://www.gamesas.com/forum/18-community-discussion/
Seeing as this relates to Skyrim though (however small) I do think it should stay here though.
Anyways, Shouting is a form of magic. While not created bu humans, they have had it for so long I think either the magic or the humans adapted to it to such a degree that they can use it without negative effects. Else I highly doubt we could be using Fire Breath
