Posted 9/28/2014 10:09 PM (GMT 0)
ppim, the forum you posted on is for IBS, which is irritable bowel syndrome. Diagnosing IBS is a process of elimination where inflammatory disease is ruled out among other things. You can't diagnose IBD or CA without a colonoscopy, but in a colonoscopy they are easily distinguished via biopsy.
If you are struggling with diarrhea and weight loss a scope seems like a reasonable next step.