Just like some people get arthritis which is an inflammation of the joints, it is also possible to get inflammation of the colon . Germs can cause colitis. Poor blood supply can cause colitis.
Some medications can cause colitis.
However, in most cases, the cause of colitis is not known. Diet and psychological factors do not cause ulcerative colitis or Crohn's disease. No germs have been found to cause these conditions. It does not affect the small intestine or the stomach . Ulcerative colitis generally starts in the rectum and spreads from the rectum toward the first part of the colon in a steady progression.