Prevention is to develop healthy living habits, avoid high-risk cancer-causing factors, raise awareness of cancer prevention and “prevent cancer before it happens”, so preventing the occurrence of cancer cannot just rely on 1 to 2 routine medical checkups per year, otherwise you will step into the 1st misunderstanding.” Usually you never take any injection or medicine”, then do you usually have healthy habits? Two packs of cigarettes and one bottle of wine a day, long-term bad habits will accumulate the risk of cancer, so it is crucial to develop good habits: ① Maintain positive and optimistic emotions, exclude negative, depressing and fearful mindset; ② Adhere to exercise, gradually increase and ensure sufficient exercise, maintain a healthy weight; ③ Ensure sufficient sleep and good sleep quality every day, live a regular life, do not stay up late; ④ Prevent ⑤ Quit smoking, avoid alcohol abuse, ensure rich, comprehensive and balanced nutrition, low salt, low fat, moderate intake of high quality protein, rich vitamins and trace elements, and a variety of green vegetables and fruits daily, etc. Secondary prevention is early detection, early diagnosis and treatment, “prevention of cancer at the beginning”, in this stage, screening physical examination plays an important role. At present, health checkups are the welfare of employees in most units, but they are not a formality and should be undertaken by standardized and medically qualified units, which require experienced medical examiners or clinicians for physical examination, blood biochemical testing equipment (not just tying fingers for manual blood smear), necessary diagnostic equipment, such as X-ray machines (mammography), B-ultrasound, CT, etc. The second misconception is that the physical examination is a “formality”, the physical examination is not comprehensive and not standardized. The third misconception is that due to personal factors, fear of physical examination, think that as long as a blood pressure, do an electrocardiogram on the line, afraid to draw blood, rectal examination (indeed, there is discomfort, but the value of the detection of rectal lesions). The last misconception is that “too much reliance on physical examination”, physical examination can not replace hospital consultation, it is only a screening process, when suspicious symptoms are found, it is necessary to go to a regular hospital for detailed examination, and physical examination should be combined with their own subjective symptoms, although everything is normal in the physical examination, but really have “stomach”, “abdomen” and other discomfort, or to go to the hospital to check, some diseases, physical examination can not detect There are some diseases that cannot be detected by physical examination, such as pancreatic cancer, because of its deep anatomical location, conventional ultrasound often cannot detect the lesion and thin layer CT examination is needed. One of the main reasons for the improvement of overall cancer diagnosis and treatment is that there are more cases of “early detection”, which of course is also related to the types of cancer, such as lung cancer, breast cancer, cervical cancer, stomach cancer, colorectal cancer and liver cancer, the early diagnosis rate of which has increased significantly. However, there are also tumors that are extremely difficult to be diagnosed early, such as pancreatic cancer, where the early diagnosis rate is less than 5%. In principle, adults over 20 years old can take cancer checkups, but of course, high-risk groups should pay more attention. High-risk factors include age, gender, race, type of work, living habits, history of special diseases and family history, etc. It is generally believed that more than 95% of cancer patients are over 40 years old, and men are older than women, with bad hobbies and eating habits, history of occupational diseases, history of special diseases (hepatitis, familial polyposis) and family history of tumors, etc. With the improvement of people’s living standard, the change of diet structure and living habits, the increasing severity of atmospheric and environmental pollution and the increase of life expectancy of the aging population. The mortality rate of cancer in China has risen to the 1st and 2nd place, which has become a social issue of concern. Men, women, young and old, any gender and age have the possibility of developing cancer, but the risk of developing cancer generally increases with age (immune function gradually declines). Studies have shown that the incidence of malignant tumors increases by about 11.44/100,000 for every 1 year increase in average age. In the composition of tumor incidence among people of different ages, the incidence rate of tumor in people over 65 years old has the largest proportion, about 55.36%. There are many factors for the elderly to talk about cancer and avoid cancer checkups, the objective reasons may be related to the lack of social care, children care and other social problems, the subjective factors may be related to the lack of correct “cancer prevention awareness”. Although we have not yet conquered cancer, we have acquired some knowledge of cancer causes and preventive interventions. People should break the pessimistic concept of “talking about cancer” and look at it scientifically and dialectically. Every healthy individual has “proto-oncogene”, genetic and chromosomal abnormalities to varying degrees, which is also known as genetic susceptibility, but under the monitoring of “oncogene” and normal immune system, they are in a balanced state and will not produce lesions. With the popularization of cancer prevention and anti-cancer knowledge, more and more people can take the initiative to have medical checkups, among which intellectuals are the majority, and employees of enterprises and institutions with better welfare, government and schools are the “main force” of medical checkups. However, there are still many groups that have not been given enough attention: ① retired elderly people, the street community should increase similar services; ② white-collar and gold-collar workers, because they are too busy to take care of other; ③ the coverage rate of medical checkups for the majority of farmers in urban and rural areas still needs to be improved. The occurrence of cancer is the result of many factors. The stimulation of high-risk factors breaks the balance of the body’s defense mechanism, and the “proto-oncogene” will be activated, and the abnormal genetic characteristics will produce the cancer-causing phenotype, which will eventually produce tumors through a complex cancer process. It takes a long time to change from normal cells to tumor cells. Pancreatic cancer is a recent tumor of concern, as Pavarotti passed away because of it, and its malignancy is extremely high, but recent research results in Nature, the world’s leading journal, show that the process of gradually evolving from normal pancreatic ductal epithelial cells to cancer cells until distant metastasis may take more than 10 years, in other words, we have a window of more than 10 years to prevent it, detect it early, and treat it effectively. In other words, we have a window of more than 10 years to prevent it, detect it early and treat it effectively. Healthy lifestyle, positive and optimistic life attitude and scientific knowledge of cancer prevention are the three elements to maintain the “harmonious and balanced” health status of our body. What to pay attention to in cancer prevention physical examination Treat correctly and cooperate actively. Women of childbearing age who have had sexual intercourse in the past one month and have the possibility of pregnancy must be carefully evaluated before the examination: the use of laxatives, X-ray and CT examinations, mammography, and sedative and pain-relieving drugs in gastroenterology examination may affect pregnancy and pregnancy. If you have high blood pressure, heart disease, diabetes, kidney disease, stroke, Parkinson’s disease, or a history of cancer or gastrectomy, you should inform the staff in time to make the best arrangements and recommendations for your individual case. Pay attention to the doctor’s prompting during the examination, actively cooperate, take the initiative to communicate and express physical discomfort, so as to increase the relevance of the examining physician (e.g., if you have recently had blood in your stool, focus on the colorectum). Wait patiently for the results after the checkup, and consult the doctor whether further medical treatment is needed according to the checkup report. We should not enter into misunderstandings in cancer prevention physical examination, develop healthy living habits, avoid high-risk cancer-causing factors and raise cancer prevention awareness, so that we can “prevent cancer before it happens”.