The prevalence of coronary heart disease among our residents is rising year by year, and it has become the “first killer of mankind” that threatens the health of the residents. Coronary heart disease in the end is what? Do patients with coronary heart disease who do not have angina still need treatment? Why does sudden cardiac death occur in seemingly healthy people? Below to bring you together to recognize coronary heart disease. First, what is coronary heart disease? The heart, like other organs, needs blood to supply the necessary nutrients. Coronary heart disease refers to coronary artery atherosclerosis so that the lumen of the blood vessel is narrowed or blocked, or (and) due to functional changes in the coronary arteries (spasm), resulting in myocardial ischemia, hypoxia or necrosis caused by heart disease. Clinical symptoms often manifest as a feeling of chest suffocation, crushing or suffocating pain, and can radiate to the neck, lower jaw, left shoulder, left arm and back. There may be dizziness, shortness of breath, sweating, nausea and fainting. Severe cases can die of heart failure or myocardial infarction. What are the risk factors for the development of coronary heart disease? ① The risk factors for the development of coronary heart disease are: hypertension, hyperlipidemia, diabetes mellitus, obesity, excessive alcohol consumption, smoking, lack of activity, mental stress and so on. ② Men > 45 years old, women > 55 years old or postmenopausal, family history of cardiovascular disease. ③Triggering factors: exertion, strenuous exercise, emotional excitement (anger, anxiety, excitement), sudden changes in climate, satiety and so on. Third, what are the types of coronary heart disease? Due to the coronary artery lesions occurring in different parts, scope and degree of coronary heart disease has five different clinical types: angina pectoris type, myocardial infarction type, heart failure and arrhythmia type, sudden death type, asymptomatic myocardial ischemia type. Fourth, does coronary heart disease without symptoms also need treatment? “There is a category of coronary heart disease called asymptomatic myocardial ischemia type coronary heart disease.” Experts remind, “some patients have extensive coronary artery blockage but did not feel angina, and even a few patients in myocardial infarction did not feel angina. Certain patients realize that they have a myocardial infarction only when they have a sudden death and are taken to the hospital for resuscitation.” “This is because some patients are found to have coronary artery disease only when coronary angiography is done because of ischemic manifestations on the electrocardiogram, or arrhythmias, or a positive exercise test.” These patients have the same chance of sudden cardiac death and myocardial infarction as patients with symptomatic coronary artery disease, so they should pay attention to their usual cardiac care. Go to the hospital as early as possible, so that early detection and early treatment to prevent the deterioration of the condition. Fifth, why does sudden cardiac death occur in those who seem to be healthy? This is mainly because of something called “unstable plaque”. This plaque may not cause any symptoms because it is small and does not block blood vessels. But because of its instability, the plaque can suddenly rupture and form a localized blood clot. As the thrombus develops, it may eventually block the coronary artery completely, leading to severe ischemia and hypoxia of the heart muscle, threatening the patient’s life.