The occurrence of diarrhea for several consecutive days may be the occurrence of bowel cancer, but it is relatively rare, and most of them may be caused by non-cancer factors such as intestinal infections, medications, poisoning, and so on. Colon cancer is a malignant tumor caused by hereditary factors, and one of the early manifestations of the disease is the change of bowel habit, which can be accompanied by excessive bowel movement, diarrhea and other symptoms. However, it can also be accompanied by symptoms such as blood in feces, abdominal pain and fatigue. In addition, non-cancer factors can also lead to diarrhea for a few days, such as when intestinal infections due to viruses, bacteria, etc.; taking drugs such as laxatives, digitalis, etc.; eating undercooked lentils, puffer fish poisoning and so on. After the symptoms of diarrhea for a few days, patients should go to the hospital in time for standardized diagnosis, in order to treat the cause.