There are no obvious specific lung cancer symptoms in the early stage of lung cancer. If a patient who did not have cough in the past coughs recently, and the cough does not heal after more than two weeks of treatment, or if an elderly patient with chronic bronchitis has cough for a long time, but the sound or nature of the cough has changed recently, it indicates the possibility of cancer. It is worth mentioning that some lung cancers do not start with respiratory symptoms such as coughing, but first appear with symptoms outside the respiratory tract, such as joint pain, frozen shoulder, etc. Early symptoms of lung cancer include the following seven aspects: (1) cough: about one-half to two-thirds of patients have cough as the first symptom; (2) hemoptysis: one-third to one-half of patients have this symptom, which is mostly occasional blood in sputum, and about one-third of patients have this symptom as the first symptom; (3) chest pain: one-third to three-fifth of patients have chest pain; (4) chest tightness and shortness of breath: one-tenth to (5) Fever: Fever caused by obstructive pneumonia or cancer fever; (6) Symptoms caused by tumor metastasis, about 10%; (7) Extra-pulmonary symptoms: osteoarthrosis, ectopic endocrine syndrome. Symptoms such as the above need to visit the hospital for timely examination.