Is there a better way to detect lung cancer earlier? This is actually a topic that has been discussed by scholars. Currently, one of the most important means of early detection of lung cancer is to enhance the screening of people at high risk of lung cancer. High-risk group of lung cancer refers to those people who have high incidence of lung cancer and high relative risk of lung cancer. So, who are the high-risk group of lung cancer? In fact, it is still difficult to identify the high-risk group of lung cancer. The lung is located in the chest cavity and cannot be observed or touched directly by the naked eye, unlike breast cancer, thyroid cancer and other tumors on the surface of the body that can be detected by patients’ self-examination. However, for those who are over 40 years old and meet the following conditions, they should pay high attention and do screening as early as possible: 1. long-term smoking with a smoking index of 400 years or more sticks (the number of years of smoking multiplied by the number of sticks smoked per day); 2. second-hand smoke for more than 20 years; 3. those who work in a confined environment for a long time and receive excessive radiation exposure inside and outside the body, such as individuals who work in metal mines and are exposed to large amounts of inorganic arsenic, asbestos, chromium, nickel, etc. 4. Those who have been exposed to soot or oil smoke for a long time, such as those exposed to gas, asphalt, coke workers, etc. 5. Those who have a family history of lung cancer. In addition, if you have the following discomforts, you must go to a specialist hospital as soon as possible, such as long-term, chronic and unusual cough, especially with frequent irritating cough; repeatedly coughing up sputum with blood in the sputum or even appearing bright red; inadvertently finding pain in one area, such as chest pain, etc. In recent years, research on lung cancer susceptibility genes has progressed and numerous lung cancer-related susceptibility genes have been identified. The detection of these susceptibility genes can predict the possibility of lung cancer occurrence in advance, thus guiding early clinical detection. However, up to now, due to the complexity of this research and the influence of various factors such as detection methods, it still needs some time before it can be applied in practice.