Myocardial infarction, as we normally refer to, is myocardial necrosis caused by acute and persistent ischemia and hypoxia in the coronary arteries. In China, there has been a significant increase in recent years, with at least 500,000 new cases occurring each year. Many people understand heart attack as a sudden and violent attack with high mortality rate, which is dangerous and cannot be prevented. In fact, before the arrival of the heart attack, the body will report in advance, there will be 1 heat, 2 pain, 3 more and a series of signs, especially people with high cardiovascular disease factors to pay more attention to know these may be able to prevent in advance at a critical moment! Today, we will learn about the various common signs before the onset of heart attack. 1) Fever 1) generalized fever: Before the onset of heart attack, white blood cells will be significantly higher and red blood cells will drop, which will lead to generalized fever, and the symptoms of generalized fever will usually last for 1 to 2 days. (2) Chest stuffiness: Many patients will have chest fever, or pressure-like sensation before the onset of heart attack. 70% of heart attack patients will have unexplained panic attacks and chest stuffiness, etc. If the patient has been in good health, but recently always feels weak, chest stuffiness, and always experiences shortness of breath and lack of stamina when doing exercise, it may be indicative of cardiovascular problems. In addition, patients should go to the hospital in time to do the appropriate examination. 2. Pain 1) Chest pain: A few days before the attack of heart attack, some patients often feel tightness in the chest, which may last only a few minutes at first and will be repeated afterwards. Chest pain is the typical symptom and the most common symptom of myocardial infarction. Sudden onset of crushing, smothering or suffocating pain located after the upper or middle part of the sternal body. These are the symptoms of coronary angina, and frequent attacks or aggravation must be careful that it is an incoming heart attack. (2) Other radiating pain: sometimes the pain can be located in the upper abdomen, radiating to the neck, jaw, left scapula or right anterior chest, and the pain can disappear quickly or there is only discomfort and stuffiness in the left anterior chest. In addition, some toothache may also be one of the precursor symptoms of a heart attack. It is common in elderly patients or diabetic patients. 3.More – more sweating The sudden onset of chest pain and heavy sweating is one of the typical symptoms of heart attack. If you are in a normal condition, your body sweats a lot without warning. This is when you need to focus your attention, because when the blood output within the heart is drastically reduced, it can easily lead to profuse sweating. Many acute heart attacks are preceded by profuse sweating. If you suddenly sweat profusely and can’t find the cause, you should wonder if there is something wrong with your heart. 4, how to first aid when angina attack When angina attack, first of all, immediately stop all activities, rest in place. Take out the first aid medicine you carry with you, such as nitroglycerin, chew it up and put it under your tongue, usually the pain can be relieved in about two minutes. If the effect is not good, you can take another one under the tongue after 5-10 minutes. After that, if the pain is still not relieved, seek immediate medical attention to rule out heart attack. We learned from the above that some patients with myocardial infarction disease will have the above-mentioned 1 heat, 2 pain and 3 more symptoms before the attack. Be sure to pay more attention. Heart attack can happen anytime and anywhere, so it is important to take precautions in daily life and maintain good living habits. You must seek medical attention when you are unwell, so as not to delay the disease and endanger your health.