The idea of “treating the untreated” was developed as early as the 8th-7th centuries B.C. The Book of Changes states: “The gentleman thinks about problems and prevents them”. The Su Wen. The Four Qi Regulating the Gods” clearly states: “Therefore, the sage does not treat the sick to cure the unwell; does not treat the disorder to cure the unrest, this is also called. If the disease has become and then the medicine, the chaos has become and then the cure, like thirst and wear well, bucket and cast cone, is not also late?” The “Thousand Gold Essential Formula” states, “The upper doctor heals the disease that is not yet sick, the middle doctor heals the disease that wants to be sick, and the lower doctor heals the disease that is already sick.” In the Yuan Dynasty, Zhu Danxi’s “Danxi Xinfa. Not to treat the already sick to treat the not yet sick” contains: “Instead of saving and treating after the disease, it is better to take care of the first without the disease, cover the disease and after the medicine, futile. Therefore, the disease is not treated, so for the doctor’s method; before the disease and first treatment, so clear regimen of reason. If this is the case, those who think about the disease and prevent it, what is the problem? This is the meaning of the sage who does not treat the sick and treats the untreated.” Since the 1960s, the incidence and mortality rate of cancer in China have been on the rise. In urban and rural areas, cancer is the first and second cause of death respectively. According to authoritative statistics, the number of people who die from malignant tumors worldwide is about 7 million every year, among which as many as 1.3 million are in China. The pressure that cancer brings to the society, families and individuals is obvious to all. We should pay attention to the prevention of tumor and establish the view that prevention is better than cure. Diet: Long-term rough diet can easily cause damage to the digestive tract; too hot, too spicy such as spicy hotpot, hot pot, etc. can cause esophageal burns, form chronic inflammation or even ulcers, and cause precancerous lesions; rough food should also be finely crafted. Do not eat overnight, fried, too hot, too spicy, too salty, too hard, pickled, contaminated food; avoid the use of preservatives, moldy food, barbecued food, sodium nitrite is a preservative, which with amines in an acidic environment, the formation of nitrosamines, the latter is a carcinogenic substance. Aspergillus flavus contaminated rice, wheat, corn, peanuts, soybeans, etc. produce aflatoxin, carcinogenic effect; smoked, roasted food such as smoked sausage, hot legs, etc. can contain carcinogenic substances benzo(a)pyrene. Confucius said: “food is not tired of fine, braised not tired of fine”. The Su Wen? The organs of the law of the time,” pointed out that “the usual diet should be five grains for the body’s main nourishment, five fruit auxiliary, five kinds of animal meat is also very beneficial, five vegetables as a complement to each other can complement the body’s essence of the viewpoint, which is called the Chinese diet and nutrition of the outline. We should pay attention to the reasonable combination of diet. Avoid high-fat diet, pay attention to the intake of fresh fruits, vegetables and high-quality protein to prevent obesity. In the Book of Health and Wellness, it is said that there are six “appropriate” foods for health and wellness: earlier, warmer, less, lighter, slower and softer. Modern research shows that cauliflower is useful in preventing esophageal cancer, lung cancer and liver cancer. Tomatoes can prevent digestive tract cancer, breast cancer and prostate cancer; regular consumption of garlic and onion can prevent stomach cancer and esophageal cancer; regular consumption of mushroom food can prevent stomach cancer; regular consumption of bean food can prevent breast cancer. Pickled foods and salted vegetables are risk factors for stomach cancer; the risk of esophageal cancer and stomach cancer increases when the food is refined and brown, long-term iron deficiency and nutritional deficiency. Low sun concentration in the diet and low blood selenium level are prone to malignant tumors. Emotional and mental aspects: Suwen. It is written in “Shanggu Tianzhen Daxue” that “the false evil and thief wind should be avoided at times, and the true energy should be followed by the calmness and emptiness, and the disease will come from there.” It means that we should avoid the invasion of external evil, and we should regulate the spirit to avoid excessive emotions and delusion of essence. If we do not have the right emotion, we will be depressed, which will lead to stagnation of qi and blood stasis, or if qi does not distribute fluid, the fluid will be condensed into phlegm, and phlegm and turbidity will be intertwined and gradually become lumps. In Western medicine, emotion affects the neurohumoral system of the human body. Changes in emotion cause increased excitability or inhibition of the nervous system, increase or decrease of certain hormones in the endocrine system, disturbance of the balance of body fluids, accumulation of metabolites, and destruction of the internal environment, which can easily form the pathological environment for cell cancer and development. Long-term mental and emotional overstress or depression is an important factor in the occurrence of cancer. A lot of clinical practice proves that cancer patients have big trauma, or have long time mental depression or depression, while those with cheerful personality rarely suffer from cancer. In healthy people, although there is a possibility that normal cells may mutate and become cancer cells, the immune system of human body can destroy and eliminate these cells in time before they proliferate. In modern times, many people are in a state of long-term mental tension, anxiety and depression, and bad emotions can inhibit the immune function of the body, thus affecting the immune system’s ability to recognize and destroy cancer cells. We should learn to be relaxed, tolerant, quiet and free from distractions. Cancer is a kind of abnormal cell proliferation, which is a new organism formed by excessive proliferation or abnormal differentiation of normal cells in the organism under the long-term effect of certain factors. The occurrence of cancer requires certain stages, and we should pay attention to the treatment of precancerous lesions. Take gastric cancer as an example, starting from the appearance of superficial gastritis to the final cancer, it has to go through 3 stages: atrophic gastritis – intestinal epithelial hyperplasia – atypical hyperplasia, and each stage lesion is divided into light, medium and heavy, and the whole process often takes more than 10 years or decades of evolution. As long as we pay attention to it, we have sufficient opportunity to prevent it, treat inflammation and ulcer of digestive tract seriously, take anti-inflammatory and acid-suppressing drugs such as clarithromycin and omeprazole in time; take agents to strengthen the spleen and stomach including Sijunzi Tang and Xiang Sha Liujunzi Tang in time, so as to prevent the disease before it happens and prevent the change of both diseases, which can greatly reduce the incidence of gastric cancer. Liver cancer generally has a trilogy, i.e. hepatitis – cirrhosis – liver cancer. Anti-virus, liver-protective treatment and traditional Chinese medicine treatment are given when hepatitis is detected, which can greatly reduce the incidence of liver cancer. Modern science and practice prove that sports can enhance physical fitness and promote health, as well as prevent, cure, rehabilitate and take care of diseases, thus preventing some “civilization diseases” brought by modern society and having the function of keeping people young and prolonging their lives. Research shows that regular physical exercise has anti-cancer effects, such as regular physical exercise can reduce the occurrence of colon cancer. Regular physical exercise can promote metabolism, strengthen digestion and absorption, and help enhance physical fitness, which is the key to anti-cancer and disease prevention. Moreover, some experimental studies have proved that proper physical exercise can help strengthen resistance and slow down the occurrence of cancer. According to the latest survey on “cancer mortality”, the mortality rate of cancer is as high as 18 per 10,000 for those who are physically weak, 8 per 10,000 for those who are moderately fit and 4 per 10,000 for those who are physically fit. As a matter of fact, tumor cells can be formed in every person’s body every moment, but the immune system in the body can destroy them before they have time to develop in numbers. Therefore, those with strong immunity can resist the occurrence of cancer, while those with weak immunity are prone to cancer. V. Abandon bad habits: The close relationship between smoking and the occurrence of tumor has been affirmed by modern medicine. According to statistics, the incidence of tumor in smokers is 7-11 times higher than that of non-smokers, and the relationship between lung cancer and smoking is even closer, about 80% of lung cancer is caused by long-term smoking. In addition to causing lung cancer, smoking can also cause many cancers of the mouth, pharynx, larynx, esophagus, pancreas, bladder, etc. The more you smoke daily, the deeper you inhale, the longer you smoke, the higher the tar content in the cigarettes you smoke, the greater the risk of tumor induction. A little wine is good for the soul, but a lot of wine hurts the body. Italian researchers have found that drinking alcohol can damage cells, causing the body to age before it does and inducing cancer. For the sake of your health, you should try to quit smoking or smoke less; drink less. Rational application of drugs: There are various drugs that have been confirmed to induce malignant tumors. For example, long-term use of estrogen can cause vaginal, cervical and endometrial cancer; arsenic can cause skin cancer; excessive exposure to or acceptance of radionuclides, drug iodine and phosphorus can cause acute myeloid leukemia, long-term use of finasteride can induce renal pelvic disease; chloramphenicol can cause aplastic anemia, i.e. preleukemic lesions. We should use medical supplies wisely, never abuse drugs, and prolonged exposure to radiation, especially diagnostic radiation for women during pregnancy, to prevent leukemia, osteosarcoma, skin cancer, etc. Cancer treatment is a major internationally recognized medical problem. The high cost of treating cancer can often overwhelm a family, and the results may not be as good as desired. But prevention of cancer is not expensive. Preventing cancer starts from me, from little by little, treating ourselves well and living carefully, which is what we can do in our life. We hope that we can have a reasonable diet and maintain a balanced nutrition; relieve tension; change bad habits and stay away from carcinogenic substances such as tobacco; have regular checkups to assess our health status; actively treat precancerous lesions such as ulcers to prevent them from developing into cancer; and improve the cure rate by early detection, diagnosis and treatment. Overcoming cancer requires the concerted efforts of both doctors and patients and the whole society.