Lung cancer is a malignant neoplastic disease and there is no clinical term of eight early signs of lung cancer. Some lung cancer patients may have no obvious symptoms in early stage, but some patients may show various atypical manifestations such as hoarseness, cough, coughing blood, chest tightness, chest pain, dysphagia, fever, etc. in early stage. When patients have the following clinical symptoms, it is recommended to go to hospital as soon as possible to improve relevant examinations: 1. hoarseness: hoarseness is caused by lung invasion of laryngeal nerve, and about 20%-30% of lung cancer patients may have hoarseness in early stage; 2. shortness of breath: early lung tumor is large in size and easily affects normal ventilation and air exchange function of lung, which may lead to shortness of breath, shortness of breath with wheezing Cough and blood: when the tumor is located in the large bronchus of lung, it will cause irritating cough, that is, no sputum or little sputum, some patients may have white foamy sputum, blood in sputum, etc., and the effect is not obvious after taking cough and sputum medicine; 4. 5. dysphagia: when the lung tumor lesion compresses the esophagus, it may induce dysphagia; 6. fever: lung cancer may cause bronchial blockage, which may lead to obstructive pneumonia, or the pyrogenic factors secreted by lung cancer may enter the blood circulation, which may cause persistent fever or repeated fever; 7. other symptoms: besides the above symptoms, some lung cancer patients in early stage may also have joint problems. In addition to the above symptoms, some patients with early stage lung cancer may also have various extra-pulmonary symptoms such as enlarged joints, weakness of limbs, shortness of breath, nausea and vomiting as well as skin itching and rash.