The back pain of forked breath should be considered clinically in the following cases: a. Coronary heart disease, especially pain appears at the time of activity or emotional excitement, lasting several minutes can be relieved by itself, especially containing nitroglycerin can be relieved. If an electrocardiogram or cardiac ultrasound reveals the presence of myocardial ischemia, further coronary angiography is required, and stents can be implanted if necessary. Second, aortic coarctation, this disease is mostly manifested as posterior back tearing-like pain, patients often have a history of hypertension, the onset of which is accompanied by left and right asymmetric blood pressure elevation, bedside aortic ultrasound, aortic CTA can be diagnosed, and most patients need emergency intervention or surgical treatment. Third, pulmonary diseases, such as pneumothorax, etc. Patients mostly have a history of pulmonary maculopathy or a lean and tall body type, and have pain in the chest and back with dyspnea after sudden exertion; pulmonary CT helps to make a clear diagnosis, and closed drainage is needed to relieve symptoms if necessary.