C is constipation. D is diarrhea. I have Crohn's and didn't know these either, but Google was my friend. I personally don't distinguish. Diarrhea largely affect

C is constipation. D is diarrhea. I have Crohn's and didn't know these either, but Google was my friend. I personally don't distinguish. Diarrhea largely affects individuals who have Crohn's in the colon (not me) due to the colon's role in body water absorption from fecal waste. My inflammation occurs in the ileum so I rarely, if ever, have diarrhea but I do have severe, piercing abdominal pain from scar tissue and constriction. My personal opinion from a biology background is we largely don't know jack about Crohn's/IBS and the classifications are grasping at straws. If you do want to know some of the scientific stuff the genetics side is a great place to start. NOD2 is specifically involved in Crohn's: http://en.wikipedia.org/wiki/NOD2 http://en.wikipedia.org/wiki/NOD2 and you can learn a lot of interesting things about our innate immune system.