The typical site of chest pain is in the upper middle part of the sternum, but it can also occur outside the chest, with pain or discomfort in the upper abdomen (below the glabella) being the most common; it can also radiate to the left chest, left back, left shoulder, left upper arm anterior medial; it can also radiate upward to the neck, pharynx, jaw, teeth and head; the nature of the pain is constricting and squeezing, smothering and suffocating, sharp, burning or even knife-like pain, forcing the patient to stop activities immediately. Angina usually lasts no more than 20 minutes. The symptoms can be relieved within 1-3 minutes after resting or taking nitroglycerin. Heart attack chest pain is similar in nature and location to angina, but is more intense and persistent, lasting more than 20 minutes, and cannot be relieved by rest or nitroglycerin. Patients with coronary heart disease should pay more attention to diet, exercise, and taking medication. 1, to maintain a light diet, eat more dietary fiber, less excessive animal fat and cholesterol-containing foods. 2, maintain appropriate physical work and exercise. Exercise should be gradual, should not be forced to do strenuous exercise, moderate intensity exercise (exercise slightly short of breath) is most appropriate. 3, to strictly prohibit overeating. After overeating the body to meet the needs of digestion, the heart must output a large amount of blood supply to the gastrointestinal system and other digestive system, the heart’s own blood circulation in a state of relative ischemia, triggering heart attack. 4, to avoid attack triggers, such as strenuous activities, emotional excitement and constipation, these conditions will increase the oxygen demand of the heart muscle, triggering heart attack. Also pay attention to the cold to keep warm, because the cold is easy to stimulate the body’s stress response, cold weather can lead to vascular spasm. 5, quit smoking and limit alcohol. 6.Strict control of risk factors: combined hypertension, hyperlipidemia and diabetes should be actively treated. 7.Adhere to the common medications for coronary heart disease, which must be taken: aspirin (or clopidogrel) and statins 8.Patients diagnosed with coronary heart disease should carry first-aid drugs such as nitroglycerin and cards with their name, home address, contact number and past medical history with them when they go out. By maintaining an effective healthy lifestyle and adhering to effective medications, 80% of patients with coronary artery disease are likely to remain disease-free for life.