If lesbians have vestigial pain, that is, back pain accompanied by chest pain, many differential diagnoses of their chest pain should be considered, the most important of which are several differential diagnoses, including pneumonia, coronary artery disease, aortic coarctation, pulmonary embolism, etc., as follows: First, pneumonia: whether the patient has pneumonia caused by cold or flu, especially lobar pneumonia, which can lead to chest and back pain once the pleura is involved. Second, coronary heart disease: whether the patient has coronary heart disease, first of all, to see whether there are risk factors for coronary heart disease, such as long-term smoking, as well as hypertension, hyperglycemia control is poor, the patient usually walking activity state, there is no chest tightness, chest pain, back pain episodes. Third, aortic coarctation: whether the patient has aortic coarctation, aortic coarctation is good for the main performance of long-term hypertension is not controlled, the blood pressure rises suddenly leading to aortic tear. This patient’s chest and back pain is very intense, tear-like pain. Fourth, pulmonary artery embolism: Patients with pulmonary artery embolism will have difficulty breathing due to pulmonary embolism. If blood oxygen saturation monitoring or blood gas analysis is performed, it is often found that the oxygen content in the blood, especially in the arterial blood, is relatively low, and patients can see obvious signs of pulmonary embolism if they do pulmonary artery enhancement CT.