Er said i have colitis. can this cause coffee ground diarrhea? happened after i left so didnt ask. is it an emergency or can it wait for dr appt?

Causes of colitis: Inflammation (infection, ischemic, ibd) of large intestine = colitis. For ibd: ulcerative colitis primarily involves the lining of the large intestine whereas crohn's is transmural (full thickness involvement by) inflammation of any part of the GI tract (from mouth to anus). Don't delay your referral to the Gastroenterologist please.