Thanks everyone! This is a great forum. I understand the difference between IBS and Crohn's in terms of Crohn's causing visible damage and inflammation where IBS is more a syndrome with symptoms like Crohn's, but no change to the intestines. I think my question is more whether bad IBS symptoms can mimic or seem like a mild case of Crohn's, symptomatically only. My intestinal symptoms just don't seem as bad as people with Crohn's. It's not consistently debilitating, only when I have an attack, which are several times a week. Also, since I have psoriatic arthritis, it's hard to tease apart what would be potentially Crohn's, and what's arthritis. For example, uveitis can be caused my PsA too, as obviously can joint pain. The mouth ulcers could be a result of me being gluten intolerant, though I wasn't eating gluten at the time. Regardless, I'm undergoing the testing. I just can't explain away the bleeding, since during the rectal exam there were no fissures or hemorrhoids. There wasn't tons of blood, but there were chunks and twice the entire stool was dark red. I know that can't be normal.
In terms of biopsy, my doc said they'd take a biopsy if anything during the colonoscopy looked abnormal. Then they'd biopsy that. Should I tell them just to take random biopsies, even if it looks normal?