Coronary heart disease is also called coronary atherosclerotic heart disease, coronary heart disease is divided into angina pectoris and myocardial infarction, angina pectoris, the main symptoms of chest tightness, chest pain, mainly in the precordial area of the range of the human hand size, duration of 3-5 minutes, most of the time due to emotional tension, excitement or under the strain of the emergence. Myocardial infarction symptoms are also chest tightness and chest pain, but the degree is much more serious, myocardial infarction chest tightness and chest pain patients will be manifested as a sense of imminent death, that is, the patient feels like not living, and lasts for a long time in half an hour or even more than an hour, through rest or sublingual nitroglycerin and other methods can not be relieved. The symptoms of chest tightness and chest pain, especially in middle-aged people, need to go to the hospital as soon as possible to do electrocardiogram, cardiac enzyme profile test to clarify the diagnosis.