Lung cancer, the real name of which is primary bronchial lung cancer, is a malignant tumor whose lesion originates from the mucosa or glands of the bronchi. With the accelerated pace of modernization in China, as well as the pollution and destruction of human living environment and people’s poor lifestyle and other related factors, especially the sharp increase in the number of smokers in China year by year, as a malignant tumor closely related to lifestyle, the incidence and mortality rate of lung cancer have an obvious trend of increasing year by year. The mortality rate of lung cancer in China is especially serious, the mortality rate of lung cancer in men has increased from 9.94/100,000 in the 1970s to 21.96/100,000, an increase of 120.93%, and in women from 4.59/100,000 to 8.74/100,000, an increase of 90.41%. Especially in the modernized big cities such as Beijing, Shanghai and Guangzhou, the death rate of lung cancer in Guangzhou has increased more than four times compared to thirty years ago, and among the tumor deaths in urban population, lung cancer has risen from the fourth place to the first place, and the fastest rising in rural areas is also lung cancer. According to the information provided by the National Cancer Control Research Office of the Ministry of Health, the number of lung cancer cases in China is predicted to increase by 120,000 between 2000 and 2005, from 260,000 to 330,000 for men, an increase of 26.9%, and from 120,000 to 170,000 for women, an increase of 41.7%. By 2025, China will have more than 1 million lung cancer patients per year, making it the world’s top lung cancer country. Unfortunately, due to the lack of typical symptoms and better early diagnosis methods, or the lack of attention to some early symptoms, most of the patients admitted to hospitals are already in advanced stage, losing the best opportunity for surgical and multidisciplinary radical treatment, so that the 5-year survival rate of lung cancer has been maintained at such a low level of 9%-14%. Although the etiology and pathogenesis of lung cancer are still unclear, many medical practitioners have made promising progress over the years. The following factors have been found to be closely related to the development of lung cancer: i. Smoking has been recognized as the most important risk factor for lung cancer, and it has been proved that 80%-90% of male lung cancer is related to smoking in China, and lung cancer deaths among smokers are about 10 times more than those among non-smokers. However, China’s smoking population is trending toward a younger age group, with a rising rate of teenage smoking and an estimated 9 million teenagers aged 15-19 smoking nationwide, with no less than 18 million trying to smoke. The number of passive smokers is also a staggering 540 million, and more than 100,000 people die each year in China from passive smoking, each withered life is an important reason to refuse passive smoking, people enjoy swallowing the clouds at the same time, sacrificing not only their own lives, while also sacrificing the lives of those around them. Second, air pollution Industrial pollution, exhaust gas, car exhaust have a large number of carcinogenic substances, mainly benzopyrene. There is a lot of information showing that the incidence of lung cancer is significantly higher in cities than in rural areas, and in big cities than in medium and small cities. In a city like Guangzhou with developed industries and huge traffic flow, the air pollution is becoming more and more serious, which will certainly lead to the increasing incidence of lung cancer among citizens. Food and nutrition is the most important saying left by the ancients to future generations. Each kind of food has its specific nutritional value. Some experiments have shown that vitamin A and its derivative beta carotene can inhibit tumors induced by chemical carcinogens. Vitamin A is an antioxidant and can directly inhibit the carcinogenic effects of chemical carcinogens. The intake of natural vitamin A-like, beta carotene in food is negatively correlated with the occurrence of cancer after a decade or so, and most prominently, lung cancer. In addition to the above points, there are many other high risk factors for lung cancer, such as: prolonged exposure to carcinogens such as asbestos, tar, oil, ionizing radiation under occupational exposure. The oncogene theory, which has been more intensively studied in recent years, has pushed the pathogenesis of lung cancer to the molecular level. It can be said that it is a combination of the above causes that leads to the high incidence and mortality rate of lung cancer in China. However, lung cancer is not as invincible as people think. To defeat it, prevention is important, and early detection and treatment are valuable. By prevention, we mean controlling the risk factors of lung cancer. Environmental pollution, which cannot be achieved overnight, requires the joint efforts of the government and the general public. From a personal point of view, I think we can do the following: 1. Quitting smoking is undoubtedly the most crucial and effective means. Happily, the reduction of lung cancer incidence and mortality through smoking cessation has been confirmed by the practice of several developed countries. After the United Kingdom, the United States began to control smoking in the 1970s, and by 1994, the smoking rate among men was reduced from 37% to 25%. 1992-1998 analysis of cancer incidence and mortality in the United States showed that since the 1990s, the incidence and mortality of lung cancer among men in the United States have been on the decline. 2.Healthy and regular dietary habits and adequate supplementation of various natural nutrients will not only help us form good living habits for lung cancer, but also play a preventive role for other diseases such as esophageal cancer and peptic ulcer. 3.Positive and optimistic state of mind, psychological factors are the primary link in the prevention and treatment of diseases. Having an optimistic mental state and being full of enthusiasm for life can play a more important role in health care than any nutrients. From the viewpoint of symptoms, most of the early lung cancer is characterized by atypical symptoms such as cough, chest pain and fever, which are easy to be ignored and misdiagnosed, and it is only when these symptoms recur or the effect of conventional treatment is poor that people pay attention to them, and at that time, the best time for early diagnosis and treatment is basically lost. Although some methods of early diagnosis of lung cancer have been found by leaps and bounds in molecular and cell biology, such as decoding of human genome and DNA microarray technology, they are still in the early stage of development and are not suitable for our national conditions. Therefore, a healthy lifestyle, reducing exposure to various risk factors and regular and comprehensive medical checkups are important measures to prevent lung cancer in the general public. When symptoms such as recurrent coughing, coughing up phlegm, coughing up bloody phlegm, chest pain, etc. occur, one should go to a regular medical unit and undergo regular examination and treatment in a timely manner, rather than waiting for “it to get better by itself”, or believing in so-called prescriptions and miracle cures. More importantly, after being diagnosed with lung cancer, don’t be desperate, actively cooperate with doctors’ treatment and keep an optimistic attitude, I think we will be able to overcome the disease by working together.