Ulcerative colitis is a disease that involves inflammation. In most cases, it starts in the rectum and subsequently spreads to encompass parts of or the entire large intestine as it gets worse. Ulcerative colitis is a condition that lasts a person's entire life. Ulcerative colitis may have its origin in a tear in the lining of the small intestine. The undigested food that is contained within the intestine, along with the bacteria that live there, totals in the billions. In a healthy individual, the lining of the intestines prevents these bacteria from infecting the gut wall and causing an infection.
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