There are still some signs of lung cancer that can be detected. The first four are common, 1. Cough. Recurrent unexplained cough. 2. Blood in sputum or hemoptysis. 3. Chest pain. Chest pain is the first symptom of many lung cancer patients. 4. Hoarseness of voice of unknown origin. 5. Chest tightness and breath-holding without strenuous activities. 6. Poor swallowing. Lung cancer with mediastinal lymph node metastasis. 7.Recurrent episodes of pneumonia and tuberculosis in the same area. It has been proven to be associated with the development of lung cancer. 8.Recurrent and persistent fever. Central type lung cancer often causes obstructive inflammation in the lungs due to obstruction of bronchi, resulting in recurrent fever. In addition, some pyrogenic substances secreted by lung cancer may also cause persistent fever, so it should be highly alerted. 9. Headache and vomiting. 10. Persistent pain in the whole body or a certain area. The treatment of lung cancer is a race against death, which requires a race against time, so it is necessary to achieve a comprehensive diagnosis in the shortest possible time. Ideally, all tests should be completed within 1 to 2 weeks, and then the most optimal treatment plan should be formulated. At this time, chest CT is needed, not chest X-ray, not MRI, which is easy to misdiagnose or miss.