1.Blood in stool: Many patients who have blood in stool think that it is caused by small hemorrhoids and do not pay attention to it. 2, black stool: In recent years, influenced by the trend of detoxification, many people abuse laxatives, which led to a significant increase in colon black stool disease, in fact, the common explanation is that the colon becomes black, the disease is accompanied by adenomatous polyps and intestinal cancer rate of up to 22% -55%. 3.Diarrhea: Continuous change in stool habit, including sudden constipation, diarrhea or alternating between the two, as well as a significant increase in the number of stools, are some of the symptoms of rectal cancer. If colorectal cancer is detected early, 90% of it can be cured. However, up to now, only about 20% of patients can achieve early detection. Experts say that these early symptoms of colorectal cancer are very similar to hemorrhoids, so many people will not realize it, and by the time it is found, most patients have already reached the middle and late stage, which is also an important reason for the high mortality rate of bowel cancer.