Causes, Diagnosis and Treatment of Ulcerative ColitisAbout This Hardback An inflammatory bowel disease that causes inflammation and ulcers in the digestive tract is referred to as ulcerative colitis. It affects the innermost lining of the large intestine. There are several types of ulcerative colitis such as ulcerative proctitis, proctosigmoiditis, left sided colitis, and pancolitis. Its symptoms usually develop over time. Diet, stress, and immune system malfunction are a few of its likely causes.