In every clinic, we always encounter many patients with anal bloating, which refers to the feeling of wanting to relieve stool, and in severe cases, it can manifest itself as an urge to defecate, i.e. there is essentially no stool to be defecated, but there is a repeated urge to defecate. This condition, sometimes, is very typical of local symptoms of peritoneal irritation, especially the irritation of the rectum caused by the accumulation of blood in the rectal fossa. So what exactly are the diseases that cause anal bloating? A, anal rectal disease 1, rectal, anal sinusitis rectal, anal sinus inflammation: if chronic colitis involves the rectum, can appear anal drop feeling with increased number of bowel movements, generally a long course, recurrent, varying degrees of severity of lesions. Inflammation is one of the main causes of anal swelling. 2, rectal prolapse rectal prolapse: can also be called “prolapse”, refers to the anal tissue off to the outside of the anus. The rectal mucosa is loosened and piled up in the rectum, but it has not yet come off outside the anus, which can cause a feeling of anal swelling and incomplete defecation. Intrarectal prolapse refers to the folding of the entire proximal rectal wall or simple mucosal layer into the distal intestinal cavity or anal canal during defecation, not beyond the outer edge of the anus, and persists after the fecal mass is expelled. 3. Malignant tumor of the anal canal and rectum: most of them appear in the middle and late stages of the disease with anal swelling. 4. Perianal abscess: the onset is rapid and easy to be misdiagnosed. Due to the deep location of some abscesses, the lesions mostly occur in the area innervated by vegetative nerves, and the pain is often not obvious, manifesting as cramps, cramps or rectal irritation symptoms. Second, gynecological diseases 1, posterior uterus There are many women who go to the anorectal department for anorectal swelling. There are no hemorrhoids, no inflammation and other disorders after the specialist examination, but the patient always feels the anal swelling and frequent bowel movements. After gynecological examination, she was found to have a posterior uterus. And the degree of posteriority is proportional to the severity of swelling. The symptoms can be relieved after calcination in knee-chest position. 2, chronic pelvic inflammatory disease chronic pelvic inflammatory disease is the most common cause of pelvic pain, also manifested as perineal and anal cramping pain. The characteristics of pelvic pain caused by it are mainly persistent dull pain and hidden pain, which can be manifested as hidden pain in the lower abdomen, anal swelling or lumbosacral pain and swelling, and the pain increases during exertion or menstruation. 3.Pelvic stasis Pelvic stasis is a unique disease caused by chronic pelvic venous stasis, which is clinically characterized by chronic lower abdominal cramps and pains, plant nerve dysfunction and other symptoms. It is also often manifested as anal cramping pain, which is evident during defecation and premenstruation, and is especially common in those with a posteriorly inclined uterus of degree III. The symptoms are light in the morning and heavy at night, aggravated by standing for a long time and alleviated or disappeared by lying on the side. 4. Rectal endometriosis is a disease in which the endometrium with vital growth involves the rectal wall, grows non-cancerously in the rectal wall, is affected by ovarian hormone cycles, and produces clinical symptoms such as anal cramps, urgency, and blood in the stool during menstruation. 3. Urological diseases 4. Orthopedic diseases 1. Lumbar disc herniation Most of the nerves around the anus come from the vertebral canal, and when there is a disc herniation, it compresses the nerves, so there will be swelling, which is characterized by light in the morning and heavy in the afternoon. 2, sacral tumor This kind of disease will also appear anal swelling, need to pay attention to. Many patients can tolerate anal swelling, so it is easy to ignore some serious diseases. It is recommended to identify the cause of the cramping in time when it occurs and to target treatment.