Because of the mild and atypical symptoms of early rectal cancer, it is very likely to be confused with the common hemorrhoids and lead to misdiagnosis. What they have in common is that they both have blood in the stool. The differences are: the frequency of stools increases or is irregular in patients with colon cancer, while patients with hemorrhoids generally do not increase the frequency of stools; the amount of bleeding and the bleeding condition are different; bleeding from colon cancer is often mixed with stools and the amount is larger, while bleeding from hemorrhoids is usually before or after stools and the bleeding amount is small; abdominal pain usually occurs when colon cancer has developed to a certain level, while hemorrhoids do not have abdominal pain. Therefore, it is recommended to check fecal occult blood and anorectal examination every year for people over 50 years old, and if positive, fiberoptic colonoscopy is required; if negative, it should be reviewed every 3 to 5 years. However, people with a high genetic risk need to have regular fiberoptic colonoscopies every 1 to 2 years starting at age 20.