Because the lower part of the rectum is mainly innervated by the visceral nerves, pain is not obvious when the rectum is sick, but the sensation of falling is obvious. When suffering from proctitis, dysentery and ulcerative colitis, the more serious the disease is, the more pronounced the sensation of falling, and at the same time, there will be an increase in the number of stools and pus and blood stools. This disease can only be diagnosed through proctoscopy, fiberoptic colonoscopy, and laboratory and pathological examinations. Because rectal cancer, like general inflammatory bowel disease, also has pus and blood stools and frequent stools, it is not easy to distinguish them, so if symptoms such as obvious anal cramping and swelling occur, you should seek medical treatment in time. In the advanced stage of rectal cancer, in addition to the feeling of swelling, there will be difficulty in defecation and severe pain. The rectal block block caused by old-age constipation may also cause persistent anal cramping, frequent stools and loose stools, but no pus and blood. When detailed history is taken, there is no stool for several days, and a large, dry, hard fecal mass can be palpated on finger examination, requiring manual gouging to remove the feces, and the symptoms can be eliminated. When there is a large volume of smooth muscle tumor, lipoma, or presacral cyst growing outside the rectum, it can also cause a feeling of anal swelling. Certain lesions of the sacral nerve and anal neurosis, although there are no substantial lesions, may also cause anal cramping sensation. Detailed examination should be conducted to exclude other organic lesions before making a conclusion during diagnosis.