Early screening of bowel cancer is something that needs to be paid attention to. Early screening items are as follows: 1. stool occult blood test, to take stool to clarify whether there is blood in it; 2. anal finger examination, which can check whether there is a rectal mass; 3. the most objective and direct method is to do colonoscopy, which is not particularly painful at present. At present, the early diagnosis rate of bowel cancer in China is relatively low, usually people aged over 40, people with history of intestinal polyps and inflammatory bowel disease, people who like to eat fatty meat and dislike vegetables and fruits, people with family history of bowel cancer, people with smoking and drinking habits need to have early screening of bowel cancer.