“Early detection, early diagnosis and early treatment” is currently the heartfelt advice from the medical profession to the majority of tumor patients, but for the high-risk groups, those cancers without early symptoms, how to achieve early detection? How to formulate the corresponding cancer prevention checkup according to their own situation? “Tumor screening” should be based on one’s own situation. Lung cancer high-risk groups: those who have smoked for more than 20 years, those who started to smoke under 20 years old, those who smoke more than 20 cigarettes a day (as long as one of the three is met, they are high-risk groups); those who are often exposed to oil smoke or coal smoke, etc. Screening method: low-dose spiral CT. Screening interval: High-risk groups over 40 years old should have low-dose spiral CT once a year, and if there are early symptoms of lung cancer such as cough and blood in sputum that cannot be cured for a long time, low-dose spiral CT should be done as soon as possible. Among healthy people, regular screening should also be done. Liver cancer High-risk groups: long-term carriers of hepatitis B and C viruses, people with family history of liver cancer, long-term alcoholics and smokers, patients with chronic liver disease and cirrhosis, long-term consumption of moldy food or exposure to aflatoxin, etc. Screening method: Ultrasound, blood test for alpha-fetoprotein. Examination interval: 1 examination every 6 months after the age of 40, if there is any abnormality, you must follow the medical advice to review or receive relevant treatment. Especially for those who have liver disease, they should follow the specialist’s advice to make a professional examination plan. Stomach cancer High-risk groups: people over 40 years old, family history of stomach cancer, presence of H. pylori infection, excessive alcohol consumption, and people who eat high-salt, smoked and fried food for a long time, etc. Examination method: Gastroscopy. Examination interval: Gastroscopy should be done once every other year, and it is better to do it once a year for people over 50 years old. Breast cancer High-risk groups: People aged 35 and above who have given birth for the first time, have a family history of breast cancer, have first menstruation less than 12 years old or have been menstruating for more than 42 years, etc. Screening method: Mammography and ultrasound. Screening interval: Breast ultrasound every one or two years after the age of 35, and mammography and ultrasound every one or two years after the age of 40. If significant abnormalities or high-risk types of breast are found during screening, the interval should be shortened to 3 months or 6 months. Colorectal High-risk group: People over 40 years old with one of the following, positive fecal occult blood test, family history of cancer or history of intestinal polyps, etc. Examination method: Colonoscopy. Screening interval: Colonoscopy for high-risk group, and those who are positive will be treated according to the treatment principle, while those who are negative will be reexamined by fecal occult blood test (FOBT) once a year and colonoscopy every 5~10 years. For general population, anal finger examination should be performed regularly, and FOBT should be done once a year when you are over 40 years old. Esophageal cancer High-risk group: Those who are over 40 years old and have one of the following, those who come from areas with high incidence of esophageal cancer (including Taihang Mountain area at the junction of three provinces in North China, northern Sichuan area, northern Jiangsu area, etc.), alcoholics, long-term smokers, family history of GI cancer, and those with history or symptoms of upper gastrointestinal tract disease. Examination method: endoscopy. Screening interval: High-risk groups aged 40-69 should be screened every 5 years, and if no problem is found, they can be screened every 5-10 years thereafter, and if lesions are found, they should follow the doctor’s advice. In the healthy population, endoscopic screening should also be done at age 50 for men and 55 for women, and every 5 to 10 years thereafter.