The male prostate is adjacent to the rectum and anus, and prostatitis, prostate hypertrophy, and prostate nodules can cause some anal irritation; posterior uterine tilt, uterine fibroids, pelvic inflammatory disease, and endometriosis in women can also cause different degrees of anorectal swelling. Unlike anal pain, the lighter the local distension, falling, the heavier the urgency, frequent squatting, heavy fall after the stool is still very painful, clinical is not rare. From my experience, the drop is related to a variety of perianal rectal diseases, such as inflammatory stimulation, swelling stimulation, anorectal pressure increase, female gynecological disease, male prostate disease, etc. can cause different degrees of the drop, clinical need to carefully identify. 1, internal hemorrhoids inflammation because of dry stool or other reasons, resulting in internal hemorrhoids surface mucosal erosion, edema, bleeding and a large number of submucosal thrombosis, in serious cases can be prolapsed outside the anus. Patients mostly have a strong feeling of anal drop, and patients with embedded hemorrhoids also experience severe pain. 2, rectal, anal sinus inflammation If chronic colitis involves the rectum, there will be anal drop sensation generally longer duration, recurrent, varying degrees of severity of lesions. 3, 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 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. Of course, there are other reasons 1, various inflammatory stimulation: such as bacillary dysentery, various proctitis, early rectal submucosal abscess, etc., resulting in rectal pressure; perianal diseases such as anal sinusitis, anal papillitis (i.e. anal papillomegaly edema), external hemorrhoid edema and various perianal diseases post-operative trauma stimulation, etc., resulting in increased pressure in the anal canal can cause different degrees of anal drop. 2, tumor stimulation: such as rectal cancer, prostate cancer, rectal polyps, including rectal villous adenoma pressure stimulation rectal end pressure receptors, resulting in frequent bowel movements. 3, anal stagnation pressure: long-term constipation or fecal embedment of patients, because the feces stimulate anorectal pressure receptors and feces can not be smoothly solved. 4, a variety of prolapse disease stimulation: such as repeated prolapse of internal hemorrhoids, internal hemorrhoids embedded (i.e. prolapse can not be returned after the bruising), rectal prolapse and other repeated stimulation of the anal canal and rectal end due to prolapse. 5, rectal adjacent organ disease: male prostate and rectal anus adjacent, prostatitis, prostate hypertrophy, prostate nodules, etc. will cause some anal irritation; female uterine posterior tilt, uterine fibroids, pelvic inflammatory disease, endometriosis, etc. will also appear to varying degrees of anorectal swelling. In addition, some patients may suffer from very mild diseases, but they are concerned about their condition all the time every day, and even panic and have difficulty sleeping, finally forming anal neurosis, which leads to abnormal anal swelling. Anorectal cramps can be initially identified by the duration and degree of cramps. For example, if the internal hemorrhoid is embedded, rectal tumor, or anal foreign body, the swelling is persistent and has nothing to do with defecation. The swelling after internal hemorrhoid ligation, internal hemorrhoid injection, or other perianal surgery has an obvious surgical history, that is, it is caused by the stimulation of the trauma after surgery. In women, the presence of endometriosis should be considered if the swelling is obvious during the premenstrual period, because the displaced and shed endometrium is often located at the lowest point between the uterus and the rectum (medically known as the Douglas fossa), and with the onset of menstruation, the area becomes obviously congested, leading to swelling. In short, once there is a period of anorectal swelling, it is recommended that we do not take matters into our own hands, not to mention indifferent, but should actively look for the causes and investigate the condition, so that the disease can be prevented first.