The correct reason for ulcerative colitis stays unknown. Earlier, eating regimen and stress were suspected, but now doctors realize that these elements may bother but don't bring about ulcerative colitis. One conceivable cause is an immune system breakdown. At the point when your immune system tries to fight an attacking bacteria or virus, an unusual immune reaction makes the immune system attack the cells in the stomach related track, as well. Heredity likewise appears to play a part in that ulcerative colitis is more typical in individuals who have relatives or siblings with the illness. But, many people with ulcerative colitis don't have this family history.