Coronary heart disease is a related condition caused by spasm or narrowing of the coronary arteries, about the precursors of coronary heart disease need to be considered from the following aspects: 1, the triggers that cause the onset of the disease, such as fatigue, satiety, emotional excitement, nervousness, strenuous exercise.2, the location of the pain, the discomfort that occurs in the retrosternal or precordial region of the sternum.3, the pain persists for 3-5 minutes, such as the duration of more than 20 minutes, consider a Myocardial infarction. 4, the nature of the pain, feel the sense of suffocation or suffocation, there is pressure-like pain. 5, the way of pain relief, after rest or sublingual nitroglycerin, fast-acting heart pill symptoms were relieved. When patients appear above said situation, it is recommended to go to the hospital in time for 24-hour dynamic electrocardiogram monitoring, coronary angiography, cardiac enzymes examination, clear diagnosis, and give timely treatment.