Having severe watery stools, abdominal pain/cramping, loss of appetite, mild nausea w/o vomiting of 4 days duration. Had a diagnostic colonoscopy 2 weeks prior to these symptoms and also was on keflex x 10 days prior to the colonoscopy for tx of an ingrown toenail. The colonoscopy showed ulcerative colitis which is a new finding. No obvious blood in stool. Could this be c diff?