Local symptoms: 1. Cough is the most common early symptom, about 2/3 lung tumor patients will have this symptom. It is characterized by paroxysmal irritating cough, which can be mild dry cough or severe cough with sputum varying. Hemoptysis is also one of the common first symptoms of lung tumor. When the primary foci invade the small blood vessels in the airways, the blood will flow into the airways, causing intermittent and repeated small amount of bloody sputum. Some patients may see hemoptysis occasionally, the color of blood is bright red, and the duration of hemoptysis usually ranges from several days to several months. Chest pain When the tumor involves the pleura, there will be dull chest pain lasting for several minutes to several hours. When the tumor erodes the ribs of chest wall or presses the intercostal nerves, the chest pain will be sharp and intense, and the patient will have fixed point or local pressure pain, which will be aggravated with whistling, coughing and changing position. 4, Shortness of breath: Due to the compression and obstruction of the tumor, the trachea and bronchial tubes will be narrowed, and the bronchial obstruction will lead to lung atelectasis or poor inhalation, resulting in symptoms of shortness of breath. About 20% of patients will have this symptom. One is inflammatory fever caused by lung tumor compression and obstruction; the other is cancerous fever caused by tumor tissue degeneration and necrosis. 6.Patients with advanced stage may have more obvious malignant quality. Systemic symptoms: 1. Fever The first symptom accounts for 20%-30%. There are two causes of fever caused by lung cancer, one is inflammatory fever. When central lung cancer tumor grows, it often blocks the segment or bronchial opening first, which causes the corresponding lobe or segment obstructive pneumonia or atelectasis and fever, but most of the time it is around 38℃, seldom more than 39℃. Antibiotic treatment may be effective, and the shadow may be absorbed, but it often recurs due to the poor drainage of secretion, and about 1/3 of the patients may have pneumonia in the same part in a short time. Pneumonia occurs repeatedly at the same site. Peripheral lung cancer mostly develops fever in the late stage when the tumor compresses the adjacent lung tissues and causes inflammation. Cancer fever is mostly caused by tumor necrotic tissue being absorbed by the body, and anti-inflammatory drugs are ineffective in the treatment of this kind of fever, while hormonal or indole drugs have certain curative effect. Wasting and cachexia In advanced stage of lung cancer, due to loss of appetite caused by infection and pain, increased consumption caused by tumor growth and toxin, as well as increased levels of cytokines such as TNF and Leptin, severe wasting, anemia and cachexia can be caused.