The coronary slow flow phenomenon is an angiographic finding characterized by delayed distal vessel opacification in the absence of epicardial coronary artery disease. We reported that a 33-year-old male patient with a history of exertional angina (Canadian Class II). Electrocardiographic and transthoracic echocardiographic examination were found to be completely normal. Myocardial perfusion scintigraphy revealed reversible ischemia on the anteroseptal wall of the left ventricle. Coronary angiography revealed slow flow in the left anterior descending coronary artery without any other coronary pathology.