This study was carried out in 80 patients with a mean age of 28.8±2.1, to evaluate and compare the degree and incidence of post-spinal hypotension between the patients at term undergoing cesarean section and normal patients undergoin various surgical interventions. Post - spinal hypotension seen in patients at term was found to be more frequent, significant and developed earlier than the non - pregnant patients as well as pregnant patients given general anaesthesia. This difference was found not to be related to CSF pressure, but to the level of anaesthesia determining the extent of sympathetic denervation. It was concluded that, for cesarean section, spinal anaesthesia given with proper tec¬hnique through an appropriate intervertebral space with sufficient i.v. fluid infusion, would be an easy, safe, reliable and cheap met¬hod of anaesthesia devoid of undesirable side effects of genera! anaesthesia seen in the mother and the newborn.