Heart attack is an acute, serious, life-threatening medical emergency that occurs on the basis of coronary artery lesions and is extremely harmful to the human body. It is a condition in which a portion of the heart muscle loses blood supply and becomes necrotic due to the rupture of atheromatous plaques in the coronary arteries to form a thrombus, which blocks the coronary arteries. When it comes to heart attack, we may think of such images – patients with painful hands over the chest, weakness and sweating, dizziness, vomiting, and even loss of consciousness, which are typical symptoms of heart attack, but according to clinical statistics, about a quarter of heart attacks occur without any symptoms and delay treatment, even leading to death. Therefore, a heart attack that is “painless” is more dangerous. Failure of the heart’s pain alarm system Painless heart attacks occur because of the failure of the heart’s pain alarm system and are commonly caused by the following conditions. For example, some patients with lesions in the right coronary artery are less sensitive to pain; some patients with posterior myocardial infarction may not experience pain; and some patients with subendocardial myocardial damage may not feel pain from time to time. Second, because of individual differences, patients’ sensitivity to pain is also different. For example, elderly people, because of the aging of various body organ systems, will feel relatively dull, and their sensitivity to pain will be reduced, which masks the condition. Third, painless infarction is also seen in elderly patients with diabetes combined with coronary artery disease, the coronary artery lesions of such patients often involve multi-level vessels, from the coronary artery trunk all the way to the tiny arteries, the lesions are extensive, myocardial ischemia, injury and necrosis are much more serious than those of ordinary patients, plus diabetic patients often have peripheral neuropathy, impaired plant nerve function and sensory nerve involvement, so it will lead to dull pain Even no pain sensation. Fourth, emotional changes can also affect the sensitivity of pain, and excessive stress and fatigue can make patients less sensitive to pain and become sluggish. Pay attention to the signs of heart attack The danger of heart attack is serious, if we can catch some early warning signs before heart attack and carry out timely treatment, we can repair the damaged heart muscle, reduce the number of myocardial necrosis and effectively improve the quality of life of patients. What are the signs before the occurrence of a heart attack? For example, if pain in the precordial region occurs at night or at rest, we should highly suspect the onset of heart attack; in patients with coronary heart disease, the symptoms have gradually increased in the past month, and the chest pain is more frequent, heavier, larger in scope and longer in duration than before, and cannot be relieved after taking nitroglycerin under the tongue, we should be alert to the occurrence of heart attack after these situations; in the past, we could find the triggering factors for the occurrence of angina. If there are no obvious triggers for the onset of angina, and it is accompanied by heavy sweating, vomiting, nausea, etc., seek medical attention promptly; if symptoms such as chest tightness, weakness, or panic that have never occurred before suddenly appear, or if panic and shortness of breath appear during activities and have a tendency to gradually worsen, consider the possibility of heart attack; if pain occurs in other parts of the body after exertion, such as epigastric pain, toothache, jaw pain, left shoulder and arm pain, etc., also consider the possibility of heart attack. The pain in other parts of the body after exertion, such as upper abdominal pain, toothache, jaw pain, left shoulder and arm pain, back pain, etc., should also be taken seriously. If people with hypertension, coronary heart disease, diabetes and middle-aged and elderly people suddenly have unexplained panic attacks, shortness of breath, inability to lie down, coughing, cold sweat, lowered blood pressure, pale face, sleepiness and weakness, stomach discomfort, bloating and nausea, and irregular pulse, they should think about the possibility of acute myocardial infarction and go to the hospital in time to do electrocardiogram To diagnose and treat the problem early to prevent the occurrence of adverse consequences.