Ulcerative colitis is an inflammatory bowel disease in which the inner lining of the large intestine and rectum become inflamed. It is characterized by diarrhea, abdominal pain and blood in the stool.

Yellow poop or yellow diarrhea can have many causes, and though it's often harmless, it can indicate a more serious health issue. Experts explain how to tell why your poop is yellow and when to see a ...

Black poop in the toilet can be distressing, but there are lots of reasons why black stool happens, and not all of them are serious.