Ulcerative colitis is mainly related to genetic factors to a certain extent. In addition, bacterial or viral infections can also cause colitis. Certain trigger factors in the environment can also lead to a series of physiological reactions, ultimately resulting in the occurrence of this disease. Non - specific inflammation caused by immune reactions can also damage the protective function of the intestinal barrier, thus leading to the disease.

Other factors such as high work pressure, mental stress, over - fatigue, and the stimulation of tobacco and alcohol can all lead to the onset and exacerbation of ulcerative colitis. Bleeding from ulcerative colitis is not contagious.