Clinically, 80% of tumor patients have already lost the chance of surgical treatment by the time they arrive at the hospital. Cancer should be detected early to get good treatment results. People aged 40 to 50 and over 60, people with cancer in their immediate family, people with cancer risk factors such as frequent exposure to radioactive substances, ultraviolet rays and toxic substances (e.g. nitrosamines, benzene, etc.) at work, or high risk factors of bad lifestyle such as serious pollution in work environment, long-term smoking and alcoholism, these three groups of people are at high risk of developing cancer and should have regular cancer prevention checkups. It is best for high-risk groups to be examined twice a year. There are many items in medical checkups, besides the three routine examinations of blood, urine and stool, you can select the examination items according to your own characteristics to eliminate tumors in the “budding” state. For example, patients with chronic hepatitis and cirrhosis should have liver function and abdominal ultrasound; long-term smokers should have a chest X-ray; people who eat irregularly, often drink stimulating drinks and often eat foreign fast food should have a gastroscopy; people with long-term blood in stool or abnormal stool should have an anal examination; women over 40 should have a gynecological examination every year.