There are many reasons for this symptom, and there are three common ones: the first one is chronic enteritis, which is caused by chronic intestinal congestion and edema, and the symptoms are generally not too serious, accompanied by mild abdominal pain and watery stools. The second type, ulcerative colitis, is a disease in which the number of stools increases, often accompanied by purulent stools, abdominal pain, also relatively heavy, and patients with a long course of the disease will also have the symptoms of wasting. The third type, intestinal polyps, is that if intestinal polyps affect the normal intestinal function, some of them will also have chronic diarrhea. Of course, to clinically confirm the diagnosis, it is best to do a colonoscopy to make the relevant identification.