BACKGROUND: Coronary slow–flow phenomenon (CSFP) is defined as delayed opacification of epicardial coronary arteries in the absence of obstructive coronary artery disease. CSFP is often underrecognized and presentation has wide spectrum. MATERIALS & METHODS: A total of 75 patients with coronary slow flow phenomenon were compared with 75 control with normal angiogram over a period of 2 years from January 2017 – January 2019 in the Institute of Cardiology, Rajiv Gandhi Government General Hospital, Madras medical college, Chennai. RESULTS: The most common age group was 41–60(64%), mean age was 49±10.5 years. Most common artery involved is LAD. CSFP had a wide spectrum ranging from CSA (48%), NSTEMI, UA (26.7%) and STEMI (25.3%). Male smokers had significant association with CSFP (p value <0.05). CONCLUSION: CSFP is an infrequently reported diagnosis with a benign outcome with rare occurrence of sudden cardiac death.