Gastric cancer is one of the common malignant tumors in China. 400,000 new patients with gastric cancer are found in China every year, accounting for 42% of the world incidence. The incidence of gastric cancer is characterized by a significant increase in incidence rate with increasing age; for example, the incidence rate of gastric cancer in men is 70/100,000 at the age of 45-54, 145.7/100,000 at the stage of 55-64, and 264.3/100,000 at the age of 65-74. The peak age of incidence is between 50 and 80 years old. However, it does not mean that gastric cancer is far away from young people. It is worth noting that in recent years, the trend of new gastric cancer patients in China is younger, and the proportion of young people under 30 years old has soared from 1.7% in the 1970s to 3.3% at present, therefore, gastric cancer is a common disease that seriously threatens human health in China. What should we do if we have stomach cancer? How to prevent the occurrence of stomach cancer? It is a question that people often ask, so how to prevent the occurrence of stomach cancer? Reasonable diet, regulation of emotion and active prevention and treatment of precancerous lesions of stomach are important methods to reduce the incidence of stomach cancer. If gastric cancer has been diagnosed, there is no need to be too nervous and pessimistic, as new treatments and methods are emerging constantly, and as long as standardized treatments and methods are adopted, many patients still have a good prognosis. How to prevent the occurrence of gastric cancer? Since 2000, World Cancer Day has been celebrated by the World Cancer Alliance on February 4 every year, and the theme of World Cancer Day 2010 is “Cancer is also preventable”. The prevention of stomach cancer in the United States has given us some inspiration. In the 1930s, the highest incidence of cancer in the United States was stomach cancer, but in the 1950s, when refrigerators became popular, the incidence of stomach cancer dropped to the 14th, so the occurrence of stomach cancer is also preventable. According to the large-scale epidemiological survey in China, bad eating habits, such as eating too fast, irregular meals, hot and hard food, overeating, etc., are all related to stomach cancer and should be noticed. When stomach cancer occurs in the stomach, people naturally think of it as food-related, which is reasonable. Because food directly touches the stomach and stays in the stomach for digestion, the stomach is often stimulated by physical, chemical and biological factors, while various carcinogens and carcinogenic substances in food also touch the stomach first. A large number of epidemiological surveys around the world for many years have shown that food factors play an important role in the development and prevention of gastric cancer. As it is not easy to change the general environment and genetic factors, it is easy to “control the mouth”. Therefore, the prevention of stomach cancer should start with good control of mouth. Diet should not be too salty: A healthy stomach has a very tight and perfect self-protection mechanism, i.e. gastric mucosal barrier. A high-salt diet will increase the sensitivity of gastric mucosal epithelial cells to carcinogens, such as nitroso compounds. The high incidence of gastric cancer in areas with high salt diet is true both in Japan and in China. Less smoked food and no moldy food: Smoked food, especially salted fish, is not only high in salt, but also contains a lot of nitroso compounds and polycyclic hydrocarbons, the latter being directly carcinogenic, while the former can synthesize carcinogenic nitrosamines under the action of low acid or bacteria. Moldy food and food, especially the contamination of miscellaneous Aspergillus, may be one of the carcinogenic factors. Do not eat food that is too hot, too cold, expired and spoiled; eat cancer prevention food and alkaline food with high alkali content at the discretion of the old and weak or those with genes of certain diseases, and maintain a good mental state. Change the traditional methods of preserving food, such as salting or smoking, and widely apply the method of freezing and preserving storage. Eat more milk and dairy products, consume fresh vegetables and fruits frequently, and increase the intake of meat, fish and other high protein foods. Quit smoking and drink less strong alcohol: tobacco itself contains carcinogens, and smokers have a 50% higher incidence of stomach cancer than nonsmokers, and the lower the age of starting smoking, the higher the mortality rate. Stomach cancer is 2-9 times more common in drinkers than non-drinkers, which is mainly related to the destruction of gastric mucous membrane barrier by alcohol. 2.Regulate emotion, combine work and rest, and arrange work and life reasonably What causes middle and young people to suffer from middle and late stage gastric cancer? According to some information, serious lack of sleep is the first cause. In order to finish the mountain of work, it is common for modern white-collar workers to work more than ten hours a day. Irregular diet is the second cause. White collars are too busy to pour a glass of water or go to the bathroom, let alone eat on time. Meanwhile, stress and tension are also common life and psychological conditions among white-collar workers today, and these three points are common to the increasing number of white-collar stomach cancer patients. In addition, clinically, we also find that many gastric cancer patients are emotionally impatient or introverted, which shows that irregular life and emotional instability are important triggers of gastric cancer. Therefore, having a good state of mind to cope with stress, combining work and rest, and arranging work and life reasonably are important aspects to prevent the occurrence of stomach cancer. According to Chinese medicine, stress can lead to overwork and physical deficiency, thus causing a decline in immune function, endocrine disorders and metabolic disorders in the body, resulting in the deposition of acid in the body; stress can also lead to mental tension causing qi stagnation and blood stasis and internal trapping of poisonous fire. Emotional anxiety will cause discomfort of liver qi, disharmony of liver and stomach, and the formation of tumor due to internal stasis and poison. 3, active examination and treatment of precancerous lesions In 1983, Helicobacter pylori (HP) was discovered, and the detection rate of H. pylori in active chronic gastritis and peptic ulcer lesions was 98% and 100%. According to the World Health Organization, nearly half of the new gastric cancers detected each year are related to H. pylori infection, and the risk of gastric cancer increases two to three times in H. pylori-infected individuals. Therefore, to control or even reduce the incidence of gastric cancer, the key is the need for gastric cancer screening including screening for HP, barium meal imaging or endoscopy in high-risk areas and high-risk populations. High-risk groups of gastric cancer, such as those with chronic atrophic gastritis, gastric ulcer, gastric polyps and pernicious anemia, post-gastrectomy for most of the stomach and those with family history of gastric cancer, are also classified as precancerous lesions by the World Health Organization, so it is of great significance to actively examine and treat precancerous lesions to reduce the incidence of gastric cancer. First of all, HP should be actively, early and completely removed. Currently, a triple dose including pump ion inhibitor, clamoxylin and amoxicillin or pump ion inhibitor, levofloxacin and amoxicillin and a quadruple dose containing bismuth can be used and taken orally for 2 weeks. In addition, Chinese medicine is also good for the prevention and treatment of precancerous lesions of gastric cancer. Our department has advanced the treatment of gastric cancer to the prevention and treatment of precancerous lesions and set up a special clinic for precancerous lesions of the stomach. In addition, the results of gastroscopy and pathological examination are regarded as an extension of the four diagnoses and provide a reference for clinical use of drugs. In some patients, after a period of treatment, symptoms improve and severe atypical hyperplasia is suppressed.