When malignant tumors occur in the lungs, the most common symptoms are cough, hemoptysis, chest pain, and dyspnea. Cough can be paroxysmal, irritating dry cough, or cough with small amount of sputum, and patients with secretory fine bronchial lung cancer can produce large amount of sputum. Blood in the sputum is also the main manifestation of lung cancer. The bleeding is usually fresher and the amount is not very large. Tumor growth in bronchus can cause local narrowing, which manifests as dyspnea after activity, and in severe cases, it can also appear at rest. Some patients can cause obstructive pneumonia manifestation with fever and coughing sputum, and these conditions can also occur repeatedly. For tumor invasion to mediastinum, pleura, chest wall, etc., pain can occur. The pain site is directly related to the invasion site of the tumor. Some patients with laryngeal nerve or laryngeal nerve compression or invasion can have a series of symptoms such as hoarseness and pain in the back of shoulder.