The Full form of ACS is Acute Coronary Syndromes. ACS is a term in medical science used to describe a range of conditions associated with sudden, reduced blood flow to the heart. One such condition is myocardial infarction (a heart attack) — when cell death results in damaged or destroyed heart tissue. Even when Acute Coronary Syndrome causes no cell death, the reduced blood flow changes how your heart works and is a sign of a high risk of heart attack. ACS often causes severe chest pain or discomfort in patients. It is a medical emergency that requires prompt diagnosis and care. The goals of treatment in ACS include improving blood flow, treating complications and preventing future problems. The signs and symptoms of ACS usually begin abruptly. They include chest pain or discomfort, often described as aching, pressure, tightness or burning, pain spreading from the chest to the shoulders, arms, upper abdomen, back, neck or jaw, indigestion, nausea or vomiting, shortness of breath (dyspnea), lightheadedness, dizziness or fainting, sudden, heavy sweating (diaphoresis), feeling restless or apprehensive and unusual or unexplained fatigue. Acute Coronary Syndrome is a medical emergency. Do not drive yourself to the hospital and get emergency help for a prompt diagnosis and appropriate care.