Most of the heart pains that get better after a while are considered myocardial ischemia. Myocardial ischemic attack is originally a paroxysmal attack, for persistent attacks are often considered myocardial infarction. Coronary heart disease includes angina pectoris, myocardial infarction and other types. For patients with angina pectoris, often due to exercise, exertion, emotional stimulation, etc. induced by the fist and palm of the anterior region of the lower and middle sternum appears stuffy, painful, discomfort, rest or contain nitroglycerin, within 1-5 minutes can be relieved. The patient’s symptoms usually last for 1-5 minutes and up to 15 minutes. For patients with myocardial infarction, the chest pain is severe and lasts for a long time, often more than half an hour and accompanied by nausea, vomiting, cold sweat, drop in blood pressure, shock, heart failure and other symptoms, so for heart pain for a while, it is mostly considered angina pectoris rather than myocardial infarction.