Coronary heart disease is a disease caused by abnormal lipid metabolism, which gradually causes atheromatous lipids to gather in the intima of coronary arteries to form white plaques. These plaques gradually increase over time, directly causing or inducing spasm to cause narrowing of the coronary artery lumen, blocking blood flow, leading to myocardial ischemia and producing a series of symptoms such as chest tightness, chest pain, shortness of breath and even heart rate arrhythmia. Generally, there are four types of diseases: angina pectoris, myocardial infarction, arrhythmia and heart failure. The cause of coronary heart disease is still unclear, and is related to the following factors: age, gender (men over 45, women over 55 or postmenopausal), family history (father and brother died of heart disease before 55, mother/sister before 65), dyslipidemia, hypertension, diabetes, smoking, overweight, obesity, gout, inactivity, etc. Looking at the cardiology clinics throughout the year, the cold winter season is the highest incidence of coronary heart disease and has the highest mortality rate than the summer season. The reason for the high incidence of coronary heart disease in winter is because cardiovascular is sensitive to changes in temperature. In winter, as the temperature decreases, the cold stimulates vasoconstriction, which increases blood viscosity, reduces blood flow and increases oxygen consumption, leading to myocardial ischemia and hypoxia, inducing angina pectoris and even myocardial infarction; some patients with coronary heart disease also suffer from chronic diseases such as hypertension, and blood pressure fluctuates in the case of large temperature changes. The rise in blood pressure increases the oxygen consumption of the heart muscle, which can easily lead to angina symptoms; in addition, the cold weather in winter, the amount of exercise is reduced, sweating is also less, making the human lipid intake and metabolic ratio is out of balance, blood viscosity increases, the tendency of intravascular coagulation increases, easy to form thrombus, inducing myocardial infarction; then there is a high incidence of respiratory diseases in winter, such as upper respiratory tract infections, bronchitis, pneumonia, etc., these These diseases can aggravate the condition of coronary heart disease patients. Coronary heart patients should prevent the onset of coronary heart disease in winter from many aspects: 1, first of all, it is best to do the necessary examination under the advice of the doctor, and under the guidance of the doctor to adjust the medication. 2, must pay attention to the cold to keep warm, especially the face and limbs of warm. When the temperature is low, you should avoid going out to avoid being stimulated by cold air. 3, both home and work environment should pay attention to the circulation of air in the room, if the room is not ventilated for a long time, it will lead to lack of oxygen in the room, which is very easy to induce coronary heart disease. 4, in the diet should pay attention to eat more fiber, which can stimulate the secretion of digestive juices and intestinal peristalsis, help cholesterol discharge, can prevent constipation and reduce the rate of angina and myocardial infarction; winter body is very easy to lack of water, drink more water can reduce blood viscosity, to prevent myocardial infarction. 5, in addition, also remind elderly patients with coronary heart disease and family members should pay attention to if the patient appears no obvious cause of sudden pain in the precordial area or back of the shoulder, or suddenly appear breath-holding, blue lips, violent cough, coughing pink sputum, can not lie down and other symptoms to be alert to the occurrence of acute heart attack, should be immediately sent to the hospital for rescue.