First of all, an electrocardiogram should be done to distinguish whether it is heart disease or not, and a chest CT should be done to identify aortic coarctation, pulmonary artery embolism, and tension pneumothorax. We also need to do relevant biochemical tests, such as troponin and D-dimer, including routine blood tests, because many diseases can cause chest pain, and chest pain can be quickly diagnosed by ECG, chest CT and biochemical tests. As long as the lethal chest pain is distinguished, other chest pains can no longer be anxious, and corresponding tests can be done to diagnose and give appropriate treatment. The most common clinical emergency admission for chest pain is heart disease, and now the green channel is for STEMI, i.e. ST-segment elevation myocardial infarction, where the heart vessel is completely occluded without blood supply and related symptoms occur, most typically chest pain that cannot be relieved. An electrocardiogram can be diagnosed early, but sometimes the performance is not typical and other tests are required.