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 infarctionâ€), and non-STEMI (NSTEMI; often referred to as “non-Q-wave myocardial infarctionâ€). 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.