To determine whether chest pain or lung pain is mainly determined by the combination of imaging examination, clinical symptoms and the characteristics of pain. 1. Imaging examination: there is no clinical term “lung pain”, but it can be generally understood as pain caused by lung diseases, which is a kind of chest pain; chest pain can also be caused by chest wall diseases, heart diseases, mediastinal diseases and upper abdominal diseases. Imaging tests such as CT can detect lung lesions or lesions in other organs. 2. Clinical symptoms: Lung pain is often accompanied by common respiratory symptoms, such as cough, fever, chest tightness or hemoptysis. Chest pain caused by other diseases can be accompanied by different symptoms, such as heart disease is often accompanied by chest tightness, palpitations, dizziness, etc., and upper abdominal diseases are often accompanied by nausea, vomiting and other discomforts. 3. Characteristics of pain: the pain of lung pain is generally widespread and the location is uncertain. Most of the chest pain caused by other diseases has a clear location of chest pain. Whether chest pain or “lung pain”, should be the first time to consult the doctor, improve the relevant examination and testing, to clarify the cause of the disease, to avoid delaying the condition.