Diarrhea is not normal after colon cancer surgery. After colon cancer surgery, most patients may have more frequent bowel movements than before, usually 1-2 or 2-3 times per day, without obvious diarrhea. Diarrhea usually means that the number of bowel movements increases significantly, usually >3 times a day, sometimes yellow loose stools, sometimes with pus and blood or mucus in the bowel movements. Diarrhea after colon cancer surgery may be caused by intestinal flora disorder, because before colon cancer surgery, most patients need to perform intestinal preparation and use laxatives to eliminate feces inside the intestines, which is beneficial to the operation during the surgical process. After the intestines are eliminated with laxatives, it may lead to intestinal bacterial disorder, that is, dysbiosis, and after dysbiosis, intestinal flatulence may occur, and some patients may suffer from diarrhea, that is, the number of stools increases, and sometimes it may be more than 10 times a day, and it should be treated actively, and it is usually necessary to take oral intestinal bacterial group medicines to regulate the intestinal bacterial group, including rectal enterolactone, pepcid, and so on.