In our country, the main cause of liver cancer is chronic hepatitis, mainly hepatitis B. In Europe and America, alcoholic liver, fatty liver and hepatitis C are the main causes. With the change of living habits in China, the proportion of obese people is also increasing, and the number of patients with fatty liver is also increasing, and the number of patients with liver cancer caused by fatty liver is also on the increase. If hepatitis can be effectively controlled, the proportion of liver cancer will also decrease, and because of this, many internal medicine doctors of liver disease are also involved in the field of liver cancer prevention and treatment. Although it takes decades to progress from hepatitis to liver cancer, many young people have also passed away from advanced liver cancer in recent years. A few of the causes of liver cancer in young people are family genetic factors, and most of them are still hepatitis B virus infections. If a newborn is infected with hepatitis B virus through mother-to-child transmission, or if hepatitis B virus is contracted during early childhood and is not treated in time, it is likely to progress to liver cancer in about 10-20 years. Current epidemiological surveys have shown that the chance of infection in young children under 2 years of age in China has been reduced to less than 1%, which greatly reduces the chance of liver cancer in the younger generation. Poor dietary habits may also be the culprit of liver cancer. People who drink a lot of alcohol over a long period of time have a higher chance of developing alcoholic liver, which can also lead to cirrhosis of the liver, which can develop into liver cancer. In addition, aflatoxin, which is contained in moldy food, is also a toxic substance that causes liver cancer. Aflatoxin is most likely to cause liver cancer five kinds of first-class carcinogens to avoid Aflatoxin comes from Aspergillus flavus, moldy food, peanuts, beans contain this substance. It is estimated that 80%-85% of human cancers are related to chemical carcinogens, and currently we know that chemical carcinogens have reached more than 1100 kinds. The World Health Organization has identified that there are more than 140 kinds of carcinogenic substances for animals and 21 kinds of carcinogenic substances for humans, among which there are five kinds of carcinogenic substances for humans, that is, the first-class carcinogens we can often hear: aflatoxin, nitrosamines, diflubenzin, nicotine and benzopyrene. Aflatoxin: mainly from rotten peanuts, corn, rice, cottonseed, beans, poor quality peanut oil, soybean oil, etc., is a carcinogen that clearly causes liver cancer; nitrosamines: from rotten food, vegetables, fish, eggs and dairy products, etc., we usually contact overnight vegetables, pickled foods contain nitrosamines, this substance may increase the risk of stomach cancer and other digestive system tumors; difenesin. Source from tar, asphalt, plastic burning, etc., so if you burn plastic or newly paved asphalt road may still have this substance, which can cause multi-system, multi-part malignant tumors; Nicotine: mainly from tobacco, nicotine from smoking is also a class I carcinogen, nicotine can significantly increase the incidence of lung cancer and mortality, in addition to smoking people suffer from throat cancer, lip cancer, tongue cancer, esophageal cancer, bladder cancer and Benzo(a)pyrene: mainly from barbecue, fried food, industrial emissions, car exhaust, tobacco, etc. Studies have proved that the mortality rate of lung cancer increases by 5% for every 1% increase of benzo(a)pyrene in the environment, and a certain dose of benzo(a)pyrene in food can lead to liver and digestive tract tumors. Preventing liver cancer from the cause Adjusting lifestyle is the best way to prevent cancer Early diagnosis and treatment of liver cancer is important, but a better way to reduce the incidence of liver cancer is to prevent it from the cause, that is, by preventing fatty liver, alcoholic liver, viral hepatitis and avoiding carcinogens. Hepatitis B vaccination can help us effectively control the occurrence of hepatitis B and thus avoid liver cancer. In addition, many people’s lifestyles are becoming more and more unhealthy, eating more, drinking more, exercising less and living under more stress will cause body fat and increase the chance of fatty liver. It is recommended that we can control weight by adjusting light diet, controlling alcohol consumption and exercising more to control the occurrence and development of fatty liver. In the prevention of liver cancer Maintaining a healthy lifestyle can effectively prevent cancer. The Chinese medicine ginsenoside rh2 can inhibit the development of tumor cells, induce apoptosis of tumor cells, improve the patient’s own immunity, and effectively prevent recurrence and metastasis. In daily life, we should adhere to some exercises within our ability for a long time and go outdoors more often to contact with nature, through which we can prevent many diseases including cancer. At the same time, maintaining a peaceful mind, regular life and reducing depression and anger can also help us prevent cancer effectively.