Acute myocardial infarction resulting from an occlusive thrombus is recognized on an electrocardiogram by ST-segment elevation. The earlier the reperfusion, the greater the benefit, and the time to treatment is now considered to indicate the quality of care. In the current era when percutaneous interventions are carried out so readily, it is important to remember that acute infarction is not the only cause of ST-segment elevation. We hereby report a case of Prinzmetal's angina which mimics presentation of STEMI in many respects.