After stool anal swelling is mainly considered three causes, as follows: 1, too much stool, especially dilute watery stool, easy to residual in the anal sinus, anal sinus self-cleaning function can not be completed in a timely manner, resulting in bacterial residual reproduction, leading to anal sinus inflammation, the main clinical characteristics of anal sinus inflammation is a strong downward feeling in the anus, it is recommended to use anti-inflammatory suppositories plugged into the anus, and actively treat the original disease to prevent Diarrhea; 2. Internal hemorrhoids, both stage II and stage III internal hemorrhoids will prolapse from the anus, if long-term defecation difficulties stool dry, after defecation anal internal hemorrhoids prolapse outside the anus, can not be returned by themselves, or need hand massage to return, this time will also produce a strong downward feeling, this situation is recommended to operate as soon as possible to prevent aggravation; 3. Perianal abscess, perianal abscess is an infectious disease, mainly manifested as redness, swelling, heat, pain High abscesses will have a stronger feeling of swelling, and it is recommended to identify the cause and treat it symptomatically.