Early symptoms of lung cancer usually include cough, hemoptysis, chest and back pain, wheezing and unexplained fever. As we know, lung cancer is a malignant tumor that occurs in the lung, 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 a little earlier because it occurs in the larger bronchial tubes, and cough, blood in sputum or chest discomfort appear earlier. Once the tumor involves the pleura, chest pain will appear. If the tumor develops further, pleural lesions will appear and pleural effusion will be produced. In the early detection of lung cancer, special emphasis is placed on high-risk groups, the first of which is heavy smokers, smoking more than 20 cigarettes a day for more than 20 years; secondly, there are patients with malignant tumors in the family, i.e. immediate family members, especially lung cancer patients, which means that the genes are less resistant to anti-cancerous substances and have susceptibility. In addition, those who are exposed to occupational pollution, such as working in a workplace with radioactive contamination or chemical or physical contamination that can cause cell damage, should also be examined regularly. Finally, if you have an irritating dry cough that does not improve significantly with anti-inflammatory symptomatic treatment, or worsens progressively and has blood in the sputum, you should be especially vigilant and go to the hospital for examination. Other chest pains or chest discomfort also need to be checked regularly if you are a heavy smoker and in the several high-risk groups just described. Early detection means regular physical examination, including chest fluoroscopy, chest X-ray, chest CT and blood tests, including other corresponding tests. In this way, early lung cancer can be detected and treated in time.