After anorectal disease surgery due to inflammation stimulation of the rectum and anal canal, in addition to pain there is a feeling of falling, always want to relieve stool, so this is one of the reasons why preoperative enema. The reason for the feeling of falling after surgery 1, the anus is very rich in blood vessels and nerves, the upper and lower dentate line is innervated by the body nerve, under normal circumstances, the stool through the expansion of the rectum there will stimulate the nerve, the signal is transmitted to the brain, the person will have the desire to stool, (in common parlance is the feeling of falling, want to relieve stool). But when there is inflammation in the intestines, or anal finger examination, anal surgery, anal area incision or wound pain, the rectal nerve will also be stimulated, the same signal to the brain, so people will also have the desire to stool, but not really have a bowel movement. 2, due to the patient’s fear of anal surgery, excessive mental tension, so that the post-operative patients are very sensitive to the feeling of falling. 3, post-operative perianal injection of painkillers such as methylene blue can produce reversible toxic damage to local tissue cells, sensory nerve endings fibers and their receptors, causing local tissue numbness and temporary disappearance of nociception, causing anal drop sensation. What should the patient do? 1, at this time the patient should try to relax, divert attention, do not focus on the anus, with the extension of time will automatically get better, generally no special treatment. 2, we should pay attention to the stool do not squat for a long time, to avoid dry stool, the drier the stool on the greater the stimulation of the wound, of course, the more serious the feeling of falling. 3, this falling feeling is not that there is a stool, so do not have a falling feeling to squat toilet, the more squatting this falling feeling will be stronger, the less easy to recover, while squatting for a long time the incision is also prone to congestion and edema, which is not conducive to recovery. 4, if the feeling of falling is particularly serious, to the point of unbearable, or from the drainage tube constantly flowing fresh blood, contaminated underwear, then you should immediately notify the doctor, it is likely that the wound has heavy bleeding or the possibility of continuous bleeding.