Early stage of lung cancer may have no obvious symptoms. When the disease develops to a certain extent, the following symptoms often appear: 1. irritating dry cough; 2. blood in sputum or bloody sputum. Kuang Tang Hong, Department of Oncology, Hangzhou Third People’s Hospital; 3. Chest pain; 4. Fever; 5. Shortness of breath. When the respiratory symptoms cannot be relieved by treatment for more than two weeks, especially blood in sputum, irritating dry cough, or aggravation of the original respiratory symptoms, the possibility of the existence of lung cancer should be highly alerted. Symptoms of lung cancer invading surrounding tissues or metastasis: 1. cancer invading the recurrent laryngeal nerve and showing hoarseness; 2. cancer invading the superior vena cava and showing superior vena cava obstruction syndrome such as facial and neck edema; 3. cancer invading the pleura and causing pleural effusion, which is often bloody; large amount of effusion can cause shortness of breath; 4. cancer invading the pleura and chest wall can cause continuous severe chest pain; 5. lung cancer in the upper lobe tip can invade and compress the organs and tissues located at the entrance of the thorax, such as the first rib, subclavian artery and vein, brachial plexus nerve, cervical sympathetic nerve, etc., resulting in severe chest pain, upper limb venous anger, edema, arm pain and upper limb movement disorder, cervical sympathetic nerve syndrome such as ipsilateral upper eye and face drooping, pupil narrowing, eye sunken, no sweat on the face, etc. 7. Bone metastasis should be considered as the possibility of bone metastasis due to persistent bone pain at fixed sites and elevated plasma alkaline phosphatase or blood calcium; 8. The corresponding symptoms of the metastatic organ may appear.