Lung cancer is the most common primary malignant tumor of lung. Most lung cancers originate from bronchial mucosa epithelium, so it is also called bronchial lung cancer. There are no special symptoms in early stage of lung cancer, only symptoms common to general respiratory diseases, such as cough, sputum and blood, low fever, chest pain and tightness, which can be easily ignored. However, metastasis of different organs can appear in the late stage of lung cancer, which can cause corresponding symptoms and often bring great pain to patients and even threaten their lives. In recent 50 years, many countries have reported a significant increase in the incidence and mortality of lung cancer, with the incidence and mortality of lung cancer accounting for the first place among all malignant tumors in men, and the second place in incidence and mortality in women. Therefore, we need to take early preventive measures in our daily life to avoid this disease. How to prevent lung cancer: 1. Prohibit and control smoking: To prohibit and control smoking, we should first focus on reducing the proportion of smokers in the population, and we need to make certain laws or regulations to restrict people, especially to restrict teenagers from smoking. 2.Control of air pollution: Do a good job in environmental protection and effectively control air pollution, so as to achieve the purpose of lung cancer prevention. 3.Occupational protection: For mining areas where radioactive ores are mined, effective protective measures should be taken to minimize the amount of radiation exposure of workers. For workers exposed to carcinogenic compounds, various practical and effective labor protection measures must be taken to avoid or reduce the contact with carcinogenic factors. 4. Prevention and treatment of chronic bronchitis: Since the incidence of lung cancer in patients with chronic bronchitis is higher than that in those without chronic bronchitis, it is of certain significance to actively prevent and treat chronic bronchitis to prevent lung cancer. Especially, smokers suffering from chronic bronchitis should be advised to quit smoking, because the incidence of lung cancer is higher in those who suffer from chronic bronchitis and smoke. 5.Early detection, early diagnosis and early treatment: The screening means for early lung cancer are still unsatisfactory, and the cost of lung cancer screening in the population is very expensive, and the possibility of reducing the mortality rate of lung cancer is very small. Regular consumption of the following foods can effectively prevent lung cancer: 1. Nuts: almonds can improve the body’s immune function and inhibit cell carcinogenesis. It has a relieving effect on symptoms such as dry mouth, but it is not suitable for patients with inflammation of the mouth, ulcers and nosebleeds. Ume also has an anti-cancer effect, and dates can inhibit the growth of tumor cells. 2.Garlic: Many studies have confirmed that garlic has anti-cancer and anti-cancer ability. The fat-soluble volatile oil in garlic can activate macrophages and improve the body’s anti-cancer ability, and also contains a sulfur-containing compound that also has the effect of killing tumor cells. 3.Shiitake mushroom and other fungal foods: contain polysaccharide substances and interferon inducers, which can inhibit tumors. Shiitake mushroom is effective against stomach cancer, esophageal cancer, lung cancer and cervical cancer. 4. Milk and yogurt: milk contains calcium and vitamin D, which can combine with carcinogenic substances in the intestine and remove their harmful effects. Yogurt can inhibit the growth of tumor cells. 5.Tea: tea contains catechins, which can remove radioactive substances from the body. Radiotherapy patients often drink tea is beneficial to recovery. Tea can also prevent tooth decay. 6, honey and bee milk: honey can promote metabolism, enhance the body’s resistance, improve hematopoietic function and tissue repair role. In recent years, it was found that bee milk contains special bee lactic acid, which is effective in the prevention and treatment of malignant tumors.