The following are some of the reasons for diarrhea after rectal polyp surgery: 1. The intestinal tract needs to be prepared before rectal polyp surgery, and the effects of diarrhea have not been completely eliminated, which can cause patients to want to defecate after surgery. 2. The diet is required because the intestinal function is not fully recovered, the diet is mainly liquid diet, which may also cause the phenomenon of diarrhea in patients. If the diarrhea is more frequent, it is recommended that patients go to the hospital in a timely manner, but as long as the patient does not defecate watery stools and bloody stools, diarrhea after rectal polyp surgery is relatively normal.