I heard that colitis only effects the outer most layer (mucosa) of the inside of your large intenstine. I think Chrons can effect deeper layers and more than just the large intenstine.
I think colitis is inflammation. ulcerative colitis is inflammation with ulcers. I am not sure which I have to be honest.
Surgery can eliminate UC. If you have Chrons and have surgery, the inflammation can come back in a different area.
Diagnosed with mild proctitis in March 2007: Treated with Canasa (as needed)
December 08: Began treating with Asacol 400mg (9/day) + Canasa 2x/day - Anemic
May 09: Off Canasa, taking Asacol (9/day)
Back on Canasa every other night + Asacol (9/day) + Probiotics + Iron