Lung cancer patients usually do not have obvious symptoms in the early stage. With further growth and multiplication of cancer cells, patients may have symptoms such as cough, hemoptysis, shortness of breath or wheezing, fever and emaciation. 1. Cough: Cough is usually the earliest symptom of lung cancer patients, which is usually irritating dry cough with little or no sputum, and if accompanied by infection, it will lead to increase of sputum. 2. Hemoptysis: If the tumor grows into the lumen, persistent sputum with blood or hemoptysis may occur, which is mostly seen in central lung cancer. 3. Shortness of breath or wheezing: if the tumor cells grow into the trachea or bronchial tubes, it will lead to partial obstruction of the airway, resulting in shortness of breath, wheezing and other symptoms, and in serious cases, the patient may also have difficulty in breathing. 4. Fever: If the tumor cells become necrotic, it will cause fever. 5. Wasting: the pain caused by the tumor will affect the appetite of the patient, which will lead to the symptom of wasting; or if the tumor develops to malignant state, the patient will lose weight obviously. The specific symptoms of lung cancer patients are related to many factors, some patients may have no symptoms in the early stage, and abnormalities are usually found during physical examination, if the above symptoms appear, it is recommended to consult doctor in time.