Coronary heart attack is not always angina pectoris Very often, the onset of cardiovascular diseases have corresponding symptoms, coronary heart attack will have chest pain, chest tightness, panic and shortness of breath. But not every attack is angina pectoris, there is a part of the patient, because of the pathological changes of atherosclerosis, but due to the lesion is light or the coronary artery collateral circulation is well established. So the patient himself does not feel any significant physical discomfort, and even the occurrence of a heart attack is not noticeable. However, sometimes the heart sends out certain alarms that people can fail to notice. Such as “dizziness, fatigue, a little stuffy, a little stomachache”, etc., and so on, and so on, the condition is getting more and more serious, to the hospital before the final diagnosis, this time has been greatly delayed treatment. In the hospital, often receive some usually consider themselves very healthy, but because of exercise, full meals or overwork sudden myocardial infarction “asymptomatic” coronary heart disease patients. It is because they usually do not think, and ultimately lead to tragedy. 40 years old to be alert to asymptomatic coronary heart disease People in middle age, the function of various organs of the body will decline, this time coronary heart disease will “come to the door”, especially those who are over 40 years of age, high blood pressure, high blood cholesterol, diabetes, long-term smoking and alcoholism, obesity and other high-risk groups, should be regularly to the cardiac clinic to do tracking! In order to detect early coronary heart disease and asymptomatic coronary heart disease in time, we should take precautionary measures. The risk factors for the development of coronary heart disease are as follows: 1. High blood pressure is closely related to the formation and development of coronary atherosclerosis. Deaths caused by the onset of coronary heart disease and its comorbidities are increased with the rise in blood pressure. 2, Dyslipidemia refers to elevated total cholesterol, LDL cholesterol and triglycerides, as well as lowered HDL cholesterol, and either abnormality is accompanied by increased morbidity and mortality from coronary heart disease. 3, diabetes, in addition to affecting glucose metabolism, will also disrupt protein and lipid metabolism, induced coronary atherosclerosis, the incidence of coronary heart disease, myocardial infarction incidence and mortality rate is much higher than that of the non-diabetic people, and the onset of early. Some data show that the chance of cardiovascular disease in diabetic patients is 4 times that of non-diabetic patients, and 80% of diabetic patients may die of coronary heart disease. 4, smoking. Nicotine in tobacco can make the heart rate faster, myocardial oxygen consumption increases, peripheral blood vessels and coronary artery contraction, and make the blood pressure rise. In addition, it can also increase the concentration of carbon monoxide in the blood, resulting in a decrease in the ability of the blood to carry oxygen, inducing and aggravating atherosclerosis. Studies have shown that the total mortality of male smokers, the incidence of cardiovascular disease and mortality than non-smokers increased by 1.6 times. 5, family genetics is also very important, if the parents have a history of coronary heart disease or died of coronary heart disease, then the probability of coronary heart disease in the offspring after entering middle age is much greater than the average person. Other risk factors are obesity, lack of exercise, long periods of mental stress and emotional factors, such as anxiety, depression, emotional agitation is often the trigger of coronary heart disease.