Left-sided chest pain should seek medical treatment in time, and relevant examinations such as chest X-ray, electrocardiogram, cardiac ultrasound, laboratory tests, coronary angiography, etc. should be carried out under the guidance of physicians. 1. Chest radiograph: X-ray chest radiograph can observe the lungs and heart, soft tissues of the chest wall, bones of the chest wall, etc., and make clear whether there is pneumonia, enlarged heart, fracture of ribs of the chest, etc. 2. Electrocardiogram: to find out whether there is arrhythmia, myocardial ischemia, myocardial infarction, etc. 3. Cardiac ultrasound: assess the patient’s heart function, show the structure and movement of the heart in real time, and clarify whether there is any abnormality in the structure and function of the heart. 4. Laboratory tests: such as blood routine, blood lipid test, blood troponin, myoglobin, cardiac enzyme measurement, measurement of brain natriuretic peptide, etc., to clarify whether there are infections, heart infarction, heart failure and so on. 5. Coronary angiography: It is not a routine checkup item, but is usually performed before acute myocardial infarction and cardiac surgery to clarify the condition of the coronary artery or directly perform coronary intervention. If you have left-sided chest pain, you should consult a doctor in time, choose the appropriate examination under the guidance of a professional doctor, and take appropriate treatment measures in time according to the examination results.