The causes of sudden heart attack mainly include overwork, overeating, staying up late for a long time and so on. 1. Overwork: Usually excessive physical labor or continuous tension and fatigue will aggravate the burden on the heart, which may suddenly increase myocardial oxygen demand, thus aggravating myocardial ischemia and leading to the occurrence of myocardial infarction. 2. Overeating: after consuming a large amount of high-fat, high-calorie food, the concentration of blood lipids in the body will suddenly rise, resulting in increased blood viscosity, and further inducing plaque rupture, the formation of thrombus on the basis of coronary artery stenosis, resulting in sudden myocardial infarction. 3. Long-term staying up late: staying up late tends to make the sympathetic nerves excited, which may lead to the occurrence of coronary artery spasm. If persistent coronary artery spasm occurs, it will cause myocardial infarction. If the patient has the symptom of precordial pain, it is recommended to go to the hospital in time for consultation and examination, and improve the cause of the disease after treatment.