Early stage of lung cancer mostly has no obvious characteristic clinical manifestations. Depending on the patient’s condition, symptoms such as cough, hemoptysis and chest pain may appear. Lung cancer is a kind of malignant tumor originated from the epithelium of bronchial mucosa. Symptoms and performance of early lung cancer are not specific, most patients have no obvious clinical symptoms, and most of the patients with symptoms show irritating dry cough without sputum or with little sputum, which is paroxysmal and does not last for a long time. The clinical symptoms of early lung cancer patients are different according to the size of tumor, site of occurrence and whether it invades the surrounding organs, etc. A few patients may have hemoptysis in the early stage. A few patients may have symptoms such as hemoptysis, hoarseness and dyspnea in the early stage; some patients may have symptoms such as chest tightness and chest pain, which may be aggravated by coughing, due to the compression of tumor on the surrounding tissues and organs, although their clinicopathological stage belongs to the early stage. To summarize, the symptoms and manifestations of lung cancer in early stage are not specific, which may cause patients to mistake them for other diseases. It is recommended that patients should consult doctor in time when they have unexplained cough and other symptoms, so as to avoid delaying their condition.