The most typical symptoms of colitis are abdominal pain, abdominal distension, diarrhea, blood in the stool, and mucopurulent stools, especially after eating irritating foods, which can lead to aggravation of symptoms, and repeated attacks can also induce the appearance of anemia. On examination, there are obvious pressure points in the left lower abdomen or around the umbilicus, without rebound pain or muscle tension, and active bowel sounds on auscultation. Recurrent episodes of colitis can lead to ionic disturbances and imbalances in the internal environment, which can also predispose to hypokalemia and hypochlorhydria. In addition, there is a complication of toxic colonic dilatation, and in severe cases, intestinal perforation, serious abdominal infection and infectious shock. Therefore, colitis should be treated systematically with oral aminosalicylic acid preparations and immunosuppressants, as well as with dietary modification and avoidance of irritating foods.