What are the main aspects to look at when making a preliminary judgment of whether coronary heart disease is present? The main aspects to look at age, medical history, clinical manifestations and auxiliary examination to initially determine the existence of coronary heart disease. A look at age: after 50 years of age, the incidence of coronary heart disease has risen significantly, so when patients over 50 years of age have chest discomfort, we should first consider whether there is coronary heart disease. Second look at the history: there is a history of smoking, three high (high blood pressure, high blood sugar, high blood fat) history, central obesity (men’s waist circumference greater than 90 cm, women greater than 85 cm) such as precordial discomfort is highly suspected of coronary heart disease. Three look at the performance: 1, exertion or mental stress when the sternum or precordial region of boring pain, or tight pain, and to the left shoulder, left arm radiation, lasting 3-5 minutes, after resting on their own to relieve the person. 2. Chest tightness, palpitation, shortness of breath during physical activity, which is relieved by rest. 3.Toothache, stomachache, arm pain, etc. related to exercise. 4. Chest pain and palpitation when having a full meal, being cold or watching a thrilling movie. 5, sleep at night when the pillow is low, feel chest tightness and breathlessness, need a high pillow lying position to feel comfortable; asleep, or lying down during the day, sudden chest pain, palpitation, dyspnea, need to sit up or stand up immediately can be relieved. Panic, chest tightness, shortness of breath or chest pain when having sex or straining to defecate. Panic and chest tightness when hearing noise. In short, from the teeth below, above the navel part of any pain, spicy, stuffy, suffocating feeling may be the manifestation of coronary heart disease, especially in the exertion or nervousness after the emergence of help in judgment. In addition, if this discomfort can be relieved by sublingual nitroglycerin within 1-2 minutes, it is more helpful to confirm the diagnosis of coronary heart disease. Fourth, look at the examination: discomfort immediate electrocardiogram myocardial ischemia manifestations help to determine.