Abstract: There has been an association between serum Magnesium levels and presence of Diabetes Mellitus, Hypertension, Dyslipidemia, BMI and severity of coronary artery disease. In this study we measured the serum Magnesium levels in patients having Diabetes Mellitus, Hypertension, Dyslipidemia and angiographically proven coronary heart disease and studied the trend of Magnesium levels in these individuals.