Colonoscopy is recommended for people with abdominal discomfort, suspected lower gastrointestinal diseases, people aged 50 and older, and people with a family history of intestinal tumors. Colonoscopy is the most direct and effective way to check for intestinal diseases, including colonoscopy and small colonoscopy. Colonoscopy is recommended for people who are suspected to have symptoms related to gastrointestinal diseases, such as unexplained diarrhea, abdominal mass, blood in stool, weight loss, etc., patients with intestinal stenosis, ulcers, etc., or patients whose barium meal reports show elevated tumor markers accompanied by abdominal discomfort, before intestinal cancer surgery, after intestinal polypectomy review, and bleeding from the lower gastrointestinal tract. In addition, for people around 50 years old, who currently have no obvious digestive discomfort but have never had a colonoscopy, it is also recommended to have a bowel examination, which can help to find out whether there are early intestinal lesions. A colonoscopy is also recommended for those with a family history of gastrointestinal tumors. If you are not sure if you need a colonoscopy, you can go to the hospital and ask your doctor to make a judgment.