The exact cause of ulcerative colitis is unknown, although it's thought to be the result of a problem with the immune system.
Open all pages about Ulcerative colitis
Common symptoms of ulcerative colitis include frequent diarrhoea (which may be bloody), stomach aches and needing to go to the toilet a lot.
It's not clear what causes ulcerative colitis. A possible cause is your immune system attacking your digestive system.
Ulcerative colitis is usually treated with medicines that reduce the inflammation in your digestive system. Surgery may be needed in severe cases.
Ulcerative colitis is inflammation of the lower end of your digestive system, including your large bowel and rectum.
Page last reviewed: 23/01/2019
Next review due: 23/01/2022