Cancer prevention checkup is to try to go to the hospital for medical checkup. If there is discomfort in the abdomen or other parts of the body, you should go to the hospital for examination in time, with the focus on early detection and treatment. Tumor indicators can indicate possible tumors in the body, but they are not specific indicators. In addition, gastroscopy or colonoscopy and abdominal CT examination should be done. Gastroscopy can detect whether the lesion in the stomach is gastritis, ulcer or stomach tumor; colonoscopy can also detect lesion in the colon, which is more intuitive and can be taken for pathological examination; abdominal CT examination should be performed in places where gastroscopy cannot be done. If a mass or abnormalities are found in the abdominal cavity, further examination is required, and if necessary, surgery is needed.