Symptoms: discomfort in the precordial area, chest pain and chest tightness, in the case of heart attack, the pain is longer and can last for more than 15-30 minutes, the range is also wider, and can spread to the left anterior chest and upper middle abdomen, accompanied by nausea, vomiting and fever and other symptoms, severe cases can occur shock, or even sudden death; elderly patients or non-posterior sternal pain or dyspnea may not be accompanied by chest pain and no special symptoms. First aid methods: Stop all activities immediately during an acute attack, rest in bed, minimize agitation, keep the room quiet so as not to stimulate the patient to aggravate the condition. Immediately take one nitroglycerin or 5-10 quick-acting heart pills. If the patient is found to have a weak pulse, cold extremities, indifferent expression, shock may occur, the patient’s head should be gently lowered and the feet elevated to increase the amount of blood return; if the patient appears to be wheezing, spitting a lot of foamy sputum, and too obese patients, head low foot high position is prohibited, so as not to aggravate chest tightness, the patient can be given a semi-recumbent position to reduce the load on the heart, so that the patient sublingual nitroglycerin, pain killer, aspirin The patient can be placed in a semi-prone position to reduce the load on the heart.