Introduction: Body mass index (BMI) is an important parameter regarding adiposity and obesity. Many studies have shown higher incidence of cardiovascular diseases especially coronary artery diseases in population with BMI greater than 25. (1) Studies also reveal median and ulnar nerve compression associated with an increasing incidence of higher BMI. (2) This study is an attempt to establish a relationship between median nerve conduction parameters and BMI in a healthy population group from Alneelain university faculty of medicine. . Methodology: In the present study –a descriptive institutional based pilot study- the effect of Body Mass Index (BMI) on Median nerve motor conduction latency, amplitude and velocity was analysed in 84 healthy students from Alneelain university faculty of medicine in the age group of 18-25 years.13 were underweight,49 had normal BMIand 20 were above normal. The data was collected using a self-administered questionnaire and the nerve conduction study was measured by power lab serial number G607. The median nerve was stimulated supra-maximally at two points along its course at the wrist and antecubital fossa. Nerve conduction velocity, amplitude, proximal latency and distal latencies were measured ethical approval was obtained from alneelain university ethical committee. The data was analyzed using Statistical Package for the Social Sciences (SPSS) Version 23 (SPSS) . Results:in this study there was a tendency for  amplitude to increase with increasing BMI however this does not reach the level of significance P value 0.266 No statistical significant difference in the nerve conduction velocity and latencies between BMI categories with  p values  0.157 for the velocity ,P-value .617 for  proximal latencies and p-value .581 for distal latencies   Relationship between NCS parameters and BMI   NCS parameters BMI N Mean Std. Deviation Sig. motor nerve conduction velocity Under weight 12 60.9000 9.32767 .157 normal 39 64.8590 7.56511 overweight 7 59.9429 10.13687 obesity 1 9 59.3889 8.50815 Total 67 62.9015 8.43631 Amplitude Under weight 12 3.8793 1.69063 .266 normal 39 4.4152 1.69906 overweight 7 5.6300 2.32577 obesity 1 9 4.6444 2.34280 Total 67 4.4769 1.87284 Proxy Under weight 7 .00324286 .000763451 .617 normal 29 .00351034 .001285453 overweight 4 .00360000 .000541603 obesity 1 5 .00282000 .000875785 Total 45 .00340000 .001128958 Distal Under weight 7 .00770000 .000611010 .581 normal 28 .00739643 .001516937 overweight 4 .00782500 .000865544 obesity 1 6 .00670000 .002103331 Total 45 .00738889 .001454026 Conclusion: Our study reveal that there is no effect of BMI on nerve conduction study amplitude,velocity and latencies Recommendation: larger Studies involving higher numbers of both genders and a variety of ages and with measuring the sensory component of the median nerves and other nerves is recommended.