The term ‘acute coronary syndrome’ comprises a range of coronary artery diseases (CADs), including unstable angina, ST-elevation myocardial infarction (STEMI; often termed as “Q-wave myocardial infarction”), and non-STEMI (NSTEMI; often referred to as “non-Q-wave myocardial infarction”). Symptoms of the acute coronary syndrome include chest pain, referred pain, nausea, vomiting, breathlessness (or dyspnea), sweating (or diaphoresis) and lightheadedness. Consumption of high levels of fish oil (more than 1 g/day) for a long time may reduce the risk of nonfatal heart attacks and acute coronary syndrome.