The misdiagnosis rate of lung cancer is very high, and 85% of patients are already in advanced stage when they are found. Lung cancer usually has no specific manifestation, and if the lesion grows at the edge, it often has no symptoms. If it is central lung cancer, it can show cough, coughing sputum and blood in sputum, but they are not specific symptoms. Pneumonia or bronchitis can show the above symptoms, which are often easily ignored. Even if metastasis occurs and metastasizes to bones, it may manifest as neck pain, lower limb pain, or back pain, which are often overlooked, and lung cancer is often found only after patients have serious problems and visit the doctor. Therefore, it is rather late to discover lung cancer only when there are symptoms, and many of them have no chance of surgery. Once there are high-risk factors, it is recommended to do physical examination early to detect the lesions early for more satisfactory treatment results.