The final complications that may result from prolonged untreated ulcerative colitis are toxic colonic dilatation, which, due to inflammation, leads to hypotonia of the colonic wall and can have symptoms of intermittent paralysis. The contents of the intestine, as well as the gas, can suddenly increase dramatically, causing dilatation of the intestine and thinning of the intestinal wall, resulting in symptoms of toxicity. This condition can easily produce intestinal perforation and even lead to death. Other complications include intestinal perforation, which occurs on the basis of toxic intestinal dilatation. There are also massive bleeding, intestinal polyps, carcinoma, small bowel inflammation, autoimmune diseases such as arthritis, skin mucosal lesions, and eye lesions. Patients must pay attention to this, and for those who have symptoms of colitis, they must go to the hospital as soon as possible to receive treatment and must not delay. Each of these complications is very troublesome and should be avoided as much as possible to achieve early detection and treatment so that you can get better as soon as possible. At the same time, you should also do a good job of prevention and treatment in your daily life, rest more, do not be too tired, pay attention to the combination of work and rest. Mentally relaxed, do not overstress, keep the mood relaxed and happy.