Liver cancer is one of the most common malignant tumors in clinical practice. According to the latest statistics, there are about 600,000 new cases of liver cancer each year worldwide, ranking fifth among malignant tumors. With the development of medical science, there are numerous treatment methods for liver cancer, such as surgery, intervention, radiofrequency ablation, microwave, gamma knife, radiofrequency knife, etc., so that liver cancer, which was originally called the king of cancers, becomes less desperate. The peak of recurrence is within 2 years after surgery. It can be seen that postoperative recurrence seriously affects the long-term outcome of hepatocellular carcinoma. Then how to prevent recurrence of liver cancer? According to the causes, mechanisms of occurrence and development of liver cancer, we should pay attention to the following aspects. First, we have to understand the causes of liver cancer formation. In China, most of the liver cancer patients are also chronic hepatitis B patients, and research shows that HBV (hepatitis B virus) has a close and specific causal relationship with liver cancer, and the correlation rate between them is as high as 80%. In addition, hepatitis C virus can also lead to liver cancer, so patients with hepatitis C must also frequently recheck HCVRNA. Stay away from aflatoxin. Aflatoxin is also an important factor leading to the occurrence of liver cancer. According to the World Health Organization, there is a high correlation between the degree of aflatoxin contamination and the incidence of primary liver cancer. Aspergillus flavus is widely present in the soil and produces toxins when the mycelium grows, and the spores can spread to the air and contaminate the right parasite under the right conditions to produce aflatoxin. Aflatoxin is mainly present in food, oil and its products that have been contaminated by aflatoxin. For example, aflatoxin contamination is most common in peanuts, peanut oil, corn, rice and cottonseed, and has been found in dried fruit foods such as pecans, almonds, dried hazelnuts, dried radishes and dried peppers, in animal foods such as liver, sea rice and salted fish, and in milk and dairy products. So liver cancer patients try to stay away from foods containing aflatoxin. Aflatoxin undergoes cleavage at 280°C before its toxicity can be destroyed. In addition, under alkaline conditions, aflatoxin can be converted into a water-soluble substance, so it can be removed by alkaline water washing. Rice contaminated with aflatoxin is mainly distributed in the rice bran layer, the aflatoxin in the rice bran layer is several times the rice kernel. Therefore, when panning rice, should be repeatedly scrubbed with water until the water is clear, which can remove most aflatoxins. The relationship between alcohol consumption and liver cancer has been studied more in foreign countries. With the prolonged survival of chronic alcoholic liver injury, the incidence of liver cancer among patients with alcoholic cirrhosis is almost 15%. It is well known that cirrhosis is closely related to liver cancer. the results of Tanaka’s 26-year follow-up study of 582 cirrhotic patients in Japan: the etiology of cirrhosis:, infection with hepatitis B virus accounted for 21% and alcohol accounted for 39.5, the prognosis of alcoholic cirrhotic patients was worse than other groups, and 44% of the 328 cases that died died of liver cancer. Related domestic studies have reported that about 0.5% of cases of alcohol-induced liver function impairment can be transformed into cirrhosis, and 1% to 2% of alcoholic cirrhosis will also be transformed into liver cancer after occurrence. In HBV-related cirrhosis, the incidence of liver cancer is higher in those with a history of alcoholism than in those without a history of alcoholism, so patients with liver cancer must quit drinking. Trace elements and liver cancer Trace elements have extremely important physiological and pathological significance to human beings, and their relationship with human health has been recognized by the world. Studies have shown that the excess and lack of some trace elements can induce liver tumors, which provides clues for liver cancer prevention and treatment. For example, Qidong area is a high incidence area of liver cancer and selenium-poor area, after selenium supplementation, it is initially shown that it can reduce the occurrence of liver cancer. According to the available studies, selenium, zinc, manganese and molybdenum are anti-liver cancer elements, while thorium, chromium, cadmium and nickel are to liver cancer elements. It is worth noting that excessive iron loading increases the risk of liver cancer, and this aspect is rarely reported in China and should be a cause for concern. In fact, iron is required by pathogens (bacteria, viruses, mycobacteria and protozoa), tumors and normal cells. Similarly, hepatitis B replication requires iron, and high serum ferritin facilitates the replication of hepatitis B virus. The infection of hepatitis B virus and liver cancer are closely related. In clinical practice, many patients with liver cirrhosis will have anemia due to splenomegaly and hypersplenism, and many of them will buy some iron-containing supplements to correct the anemia, which may increase the risk of liver cancer. In conclusion, liver cancer patients can eat more food or health products rich in selenium and zinc, and minimize the intake of iron, thorium, chromium, cadmium and nickel. V. Keep away from nitrosamines Domestic scientists have tested the content of nitrate and nitrite in soil and drinking water in areas with high incidence of liver cancer such as Qidong, and the results show that the content is much higher than that in areas with low incidence of liver cancer, and foods such as sauerkraut, kimchi, pickles, salted fish, ham and sausages contain nitrate and nitrite. Nitrate can be reduced to nitrite. There is also a kind of bacteria called nitrate reducing bacteria in the stomach, which can also make nitrite and amine combine into nitrosamine. Nitrosamines have strong carcinogenic effects, mainly causing liver cancer, esophageal cancer, stomach cancer and colorectal cancer. Therefore, it is better for liver cancer patients to stay away from nitrosamines, that is, to eat as few pickled products as possible. In addition, because of the instability of nitrosamines, once the food and drinking water are contaminated with nitrosamines, they will be exposed to sunlight and photolytic reaction will occur to make nitrosamines decompose and control the intake of nitrosamines. As the research on tumor prevention and treatment progresses, the relationship between mental factors and cancer is gradually attracting people’s attention. The multi-factor analysis of liver cancer reported in clinical research reveals that the risk of liver cancer in people with mental trauma is 2.98 times higher than that in people without mental trauma. When hepatitis B virus infection and psychological trauma coexist, the risk rises to 66.8 times. Scientists believe that psychosocial factors may decrease cellular immunity through the regulation of the hypothalamic neuroendocrine system and the word count nervous system, thus increasing the chance of cancer development. There was a case reported in China where a liver cancer patient saw bloody ascites when the doctor pumped ascites for him and immediately fainted and died a few minutes later. I also saw a liver cancer patient in the clinic who died in just 5 days from the discovery of liver cancer. Among the psychological factors: introversion, unpredictable family, repeated setbacks and the death of children are the most relevant factors to cancer, among which introversion is the most important risk factor. 7.Dietary precautions for liver cancer 【Dietary principles】1.Daily diet should be regular, quantitative and less frequent to reduce the burden of gastrointestinal tract. 2.Eat more foods containing vitamin A, C and E, more green vegetables and fruits. 3.Eat foods containing cancer suppressing effect, such as asparagus, cauliflower, sweet potato, cabbage, carrot, fish, etc. 4.Adhere to low fat, high protein and easy to digest foods, such as lean meat, fish and 5, food should be fresh, do not eat moldy diet. Avoid] 1, avoid smoking, alcohol. 2, avoid overeating, greasy food, avoid salt, smoke, fire and fried food, especially baked and caramelized food. 3, avoid mold, pickled vinegar food, such as moldy peanuts, moldy soybeans, salted fish, pickled vegetables, etc. 4, avoid bone-crushing, rough and hard, sticky and indigestible and coarse fiber food. 5, avoid heavy, too acidic, too sweet, too salty, too cold, too hot and too much gas containing Food. The watermelon, tomatoes and tofu soup: watermelon, tomatoes and tofu are all cut into fine shreds to make soup, with spleen, detoxification, dampness and diuretic effect, cold weakness should not be served. Artichoke carp soup: artichoke 30 carp 1, a little seasoning, has the effect of eliminating bruises and stopping bleeding. Gorgonzola stew: Gorgonzola 30, lean pork 100, both together in a casserole with the right amount of water stewed meat and drink soup, diarrhea and phlegm dispel dampness, ascites can be used for this recipe. Poria steamed guppy: Poria 15, salmon 150, add water and seasonings with the steam until cooked that is. With spleen and dampness, benefit qi and blood function.