The left side of the chest appears like a forked pain, may be angina pectoris caused by coronary heart disease. Patients with coronary artery disease, due to the narrowing of the coronary arteries, resulting in insufficient blood supply to the myocardium, such as strenuous activity, myocardial ischemia may occur, thus causing angina. In patients with angina pectoris, strangulation-like pain in the precordial region occurs, which may be relieved by rest or oral nitrate drugs. First of all, we should pay attention to rest, avoid exertion, need to go to the hospital to check the electrocardiogram, cardiac ultrasound, cardiac enzymes, coronary artery CT, to see whether there is myocardial ischemia. If a clear diagnosis of coronary heart disease, you need to apply nitrate drugs to improve the blood supply of the coronary arteries and relieve the symptoms of angina pectoris. If the narrowing of the coronary arteries is more serious, interventional therapy, or heart bypass surgery may be needed. Left chest pain, may also be suffering from intercostal neuritis, pleurisy, spontaneous pneumothorax and other diseases, need to go to the hospital to improve the relevant examination, and differential diagnosis.