Sigmoiditis is generally not cancerous, but if the disease is not effectively treated, the long-term repeated lesion stimulation will also exist the possibility of cancer. Sigmoiditis is mostly manifested as redness, swelling, congestion and even ulcerated erosion of the intestinal mucosa. After standardized treatment, the prognosis is generally good, and cancer will not occur. If it is not well treated, the course of the disease is prolonged, and the intestinal mucosa is stimulated by repeated inflammation, it may also be malignant, and a tumor of the sigmoid colon may appear. Therefore, suffering from sigmoiditis should pay attention to early standardized and effective treatment, and regularly go to the hospital to do colonoscopy. In life, eat less pickled products, consume more fresh vegetables and fruits, and maintain a good mentality and living habits.