The most common cause of sudden death is acute myocardial infarction, which progresses rapidly and is sometimes too late to save. With the awareness of this disease, we may all know that the infarction will appear in the precordial region pain, sweating and other typical symptoms, but in fact, before the onset of the infarction, there are many atypical symptoms, today I give you a summary of science, and the high-risk groups of heart attack refers to the elderly, hypertension, diabetes, hyperlipidemia, often stay up late, long-term oxygen intake and alcohol consumption, and other groups. First, a feeling of constriction in the chest, especially when the chest constriction is not relieved after rest, be alert to the occurrence of heart attack. Second, some people will have pressure pain before the occurrence of heart attack, which can be easily misdiagnosed as ordinary gum swelling pain, and for high-risk people with pressure pain, heart attack should be excluded. Third, insufficient blood supply to the heart may lead to dizziness, so patients with long-term dizziness symptoms should be alert to heart attack. Fourth, some patients have symptoms of pinprick-like pain on the soles of their feet, so if they suddenly develop pinprick-like pain on the soles of their feet and it does not ease all the time, they should be alert to the occurrence of heart attack. V. Some patients, who may also have symptoms of soreness and numbness in the left lower limb, which are not relieved after treatment such as acupuncture and physiotherapy, should be suspicious of heart attack if they appear in a group of people with a high incidence of heart attack. Sixth, if elderly people of advanced age, sudden drowsiness, weakness and sleepiness, myocardial ischemia should be highly suspected as a possibility. Seven, in patients with angina pectoris, there are patients who present with hearing loss and also with tinnitus symptoms. VIII. High-risk groups should also be alert when they have scapular pain. IX. In patients with myocardial ischemia, it is found that many patients are accompanied by weakness, soreness and pain in the left upper limb. Ten, there are more heart attack patients with headaches, so high-risk groups with frequent headaches should be alert. Friends, if the above symptoms appear, be alert to the possibility of heart attack, always have nitroglycerin, quick-acting heart pills and other drugs at home, but also learn CPR.