You know what I think is also sometimes misdagnosed as Crohn's or Irritable Bowel? Food allergies. I know a woman who started going into anaphylactic shock over a food she couldn't ID. She knew it was something common but until she got tested, didn't realise it was WHEAT! When I asked her if she had any symptoms (because it's rare to all of a sudden develop this out of the blue) she said yeah, that she had been having nausea, vomitting, and intestinal problems for years and it had been diagnosed as irritable bowel syndrome. She never got the hives type reaction.