How long you live with acute coronary syndrome is related to the severity of the condition and the timeliness of treatment. Some patients have a normal life expectancy, while others may die suddenly due to untimely treatment. Acute coronary syndrome is a very serious heart disease that includes three conditions: unstable angina, acute non-ST-segment elevation infarction, and acute ST-segment elevation infarction. Acute ST-segment elevation myocardial infarction is the most serious, at this time the coronary artery is completely occluded, the myocardium appears serious necrosis, if there is no timely rescue, the patient is likely to die of cardiac arrest. If timely coronary intervention or thrombolytic therapy is used to save the dying myocardium, some patients can be saved and can survive for several years, ten years or even longer. Unstable angina and acute non-ST-segment elevation myocardial infarction, the coronary artery appeared serious stenosis, early stent implantation, followed by drug therapy, most patients have a better prognosis, life expectancy is basically unaffected. However, if no attention is paid to it and it is not detected in time at an early stage, it may lead to sudden cardiac death after complete occlusion of the coronary artery. Specific diagnosis and treatment need to follow the doctor’s advice.