In the past 50 years, the incidence and death rate of lung cancer have been rising rapidly in countries all over the world, especially in industrially developed countries, and lung cancer has taken the first place among male patients who died of cancer. The symptoms of early stage lung cancer are not obvious, and usually when there are obvious lung cancer symptoms and then go to hospital for examination, they are mostly in advanced stage. Therefore, in daily life, please be alert to some characteristic symptoms of lung cancer, which are mainly in the following 7 aspects: 1. Hemoptysis: one-third to one-half of patients have this lung cancer symptom, which is mostly episodic with blood in sputum, and about one-third of patients have this as the first; 2. Chest pain: one-third to three-fifth of patients have chest pain; 3. Fever: obstructive pneumonia or cancer fever causes fever; 4. External symptoms: bone and joint lesions, ectopic endocrine syndrome. Therefore, it is important to raise the alertness to these symptoms and go to the hospital as soon as there is a similar situation. It can be detected by chest X-ray test, sputum exfoliative cytology, fibrinoscopy, CT, MRI, percutaneous lung puncture, lymph node biopsy, thoracentesis, tumor markers, etc. Early lung cancer diagnosis plays a great role in the good or bad treatment effect. 5.Symptoms caused by tumor metastasis, accounting for about 10%; 6.Shortness of breath in chest: one-tenth to one-half of patients have this symptom; 7.Cough: about one-half to two-thirds of patients have cough as the initial symptom.