The early symptoms of lung cancer usually include cough, hemoptysis, chest and back pain, wheezing and fever of unknown origin. As we know, lung cancer is a malignant tumor that occurs in the lungs of our respiratory organs, so the symptoms are closely related to the location of its occurrence. Generally speaking, there are two types of lung cancer: central lung cancer and peripheral lung cancer. Generally speaking, the symptoms of central lung cancer appear slightly earlier because they occur in the main bronchial tubes, and cough, blood in sputum or chest discomfort appear earlier. Peripheral lung cancer may have changes in chest pain once the tumor accumulates to the pleura at the time of detection, and if it progresses further, pleural lesions may appear and pleural effusion may develop. At present, the first group is heavy smokers, and the second group has family history and immediate family history of malignant tumors, especially lung cancer, which means that the genetic resistance to anti-cancer substances is poor. In addition, those who have been exposed to occupational pollution, such as a workplace with radioactive contamination or chemical or physical contamination that can cause cell damage, should also be examined regularly. Finally, if there is an irritating dry cough, cough nature, of course, cough is everyone will, to persist in dry cough, and to be blood, this should be particularly worried, to go to the hospital for examination. Other chest pain or chest discomfort, if you are a heavy smoker and the several high-risk groups just described, you also need to be checked regularly. Early detection means regular physical examination, including chest fluoroscopy, blood tests and other corresponding tests. This can detect early lung cancer and provide timely treatment. There are three levels of early detection. Generally speaking, if a country wants to detect lung cancer at an early stage, it is the state’s act to screen the high-risk groups, that is, the areas with high incidence of lung cancer, and the people with high incidence of lung cancer. We, as netizens, as ordinary people, have at least two things to do while the state is doing this work. First, we as a healthy people should insist on annual health checkups, which is the most important. Annual health checkups, while emphasizing the importance of the chest frontal and lateral medical examination, before some netizens said I also physical examination, after the physical examination, just do the chest X-ray, also not. Second, only the frontal chest film, take a small film, also can not. Should also do the standard chest X-ray front and side, the conditions of the region, the conditions of the unit, the conditions of the population, but also recommended to do some low-level spiral CT, the price and chest X-ray is about the same, accept the radiation is also very low. Thirdly, we remind our heavy smokers, who smoke more than 20 cigarettes a day for more than 20 years, these smokers are recommended to do physical examination every six months, and in areas with conditions and people with insurance, it is recommended to do low-dose CT, and many centers include low-dose CT into normal physical examination. We also do tumor marker-related tests are necessary. In conclusion, healthy people, smokers and residents with respiratory symptoms should be alert to the occurrence of lung cancer and should pay attention to health checkups and examinations in specialized hospitals.