Anal swelling and always needing stool may be rectal cancer, bacillary dysentery, pelvic inflammatory disease, etc. Surgery plus chemotherapy (cisplatin type) and antibiotics (quinolones, etc.) can be performed to treat the disease. 1. Rectal cancer is divided into upper and lower rectal cancer by peritoneal reflexion. Its main clinical manifestations are rectal irritation sign (feeling of dropping in anus before bowel movement, frequent bowel movement, change of bowel habit, etc.), blood and mucus on the surface of stool, progressive thinning of stool, etc. In this case, resection is often needed. Surgery to remove the cancerous bowel segment and chemotherapy drugs such as cisplatin are often needed. 2. Bacterial dysentery is mainly an intestinal infectious disease caused by bacillary dysentery, and its clinical manifestations include abdominal pain, diarrhea, mucus, pus and blood stools, as well as acute and post-acute symptoms (discomfort in the lower abdomen, wanting to defecate very much, and a feeling of incomplete defecation after defecation), which are often accompanied with systemic symptoms such as fever, etc. The disease requires prompt antibiotic treatment. The disease requires timely antibiotic treatment (ciprofloxacin in quinolone group, etc.), and fluid infusion to replenish water and electrolytes according to the situation. 3. Pelvic inflammatory disease is an inflammation of certain tissues and organs inside the pelvis, often caused by infections of the reproductive system. Its clinical manifestations include pain and swelling in the lower abdomen, abnormal discharge from the genital tract, etc. It may be accompanied by perianal swelling and affect the frequency of bowel movements. The situation requires timely antibacterial treatment, commonly used drugs are cephalosporins, quinolones and so on. The above drugs and operations should be carried out under the guidance of professional doctors. If the above situation occurs, please consult a doctor for reasonable and standardized diagnosis and treatment.