Anal swelling and wanting to poop may be caused by ulcerative colitis, hemorrhoids, rectal polyps and other diseases. 1. Ulcerative colitis: immune, genetic factors caused by a chronic non-specific intestinal inflammatory diseases, patients will have repeated episodes of abdominal pain, diarrhea, as well as anal distension, want to stool feeling, you can comply with the medical advice to use drugs such as Liuzosulfapyridine for treatment. 2. Hemorrhoids: induced by poor eating habits, constipation, sedentary and other reasons, so that the anal canal and rectal submucosal vasodilatation, the formation of blood, triggered by anal swelling, want to stool, but also blood in the stool, perianal itching, anal discomfort and other symptoms, such people should improve the poor lifestyle, less spicy and stimulating food, eat more fresh fruits and vegetables, if necessary, can be treated with surgery. 3. Rectal polyps: chronic inflammatory stimulation, the rectal surface of the bulging lesions, patients will have blood in the stool, anal swelling and want to stool and other symptoms, can be surgically removed. Anal swelling and want to stool, it is recommended that patients go to the hospital, a clear diagnosis, give reasonable treatment, to avoid aggravation of the condition.