The feeling of anal swelling after standing for a long time is a common symptom in clinical anorectal specialties, mainly due to the following reasons: 1. It may be caused by diseases of the rectal area, the pain of minor diseases is not obvious, but the feeling of falling is obvious, when suffering from proctitis, ulcerative colitis, dysentery, it may appear that the feeling of anal swelling after standing for a long time is getting stronger and stronger, and there will also be more and more obvious pain. 2. It may be a typical symptom of rectal cancer, with pus and blood stools and more frequent stools, which are not easily distinguished from intestinal inflammation, and at a later stage there may also be a feeling of increased swelling, urgency and heaviness. Therefore, if there are obvious symptoms such as anal swelling, it is necessary to go to the hospital for anoscopy or colonoscopy before distinguishing treatment.