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Background: Several elements that are either anesthesia-related (the type and span of sedation), medical procedure related (the sort of a medical procedure and the degree of the surgery), or patient-related (age, orientation, body weight, and their typical body core temperature) impact body core temperature. Strangely, not much information is available about patients' temperatures and their body mass index (BMI). The point of this study was to assess the effect of BMI on body core temperature in patients undergoing General versus Spinal anesthesia during the surgery. Duration of the surgery is also compared. Materials and Methods: An observational study was conducted in Chettinad hospital and research institute. Two sub-groups (General and spinal anesthesia), Body Mass Index and the duration of the surgery were evaluated. The actual hypothermia prevention guidelines were followed when treating patients. Temperature was measured in axilla after inducing the patient with anesthesia throughout the procedure. Each subgroup was divided into BMIs of less than and greater than 30 kg/m2 with mild and moderate hypothermia. Result: A sum of 100 patients were assessed. Fifty patients went through General anesthesia and fifty patients received spinal anesthesia for surgery. Temperature was decreased in all subgroups after the induction of anesthesia, but the decrease was more pronounced during spinal anesthesia, even in patients with BMI<30kg/m2 (less than 30). Regardless of the type of anesthesia, the type of surgery, or the BMI, throughout the course of the procedure, there was a noticeable drop of temperature. Conclusion: We conclude that, in General Aanesthesia, even the patients BMI >30 kg/m2 are less prone to hypothermia. In spinal anesthesia, even patients with BMI <30 kg/m2 are more prone to hypothermia. As the duration of surgery increases, irrespective to the type of anesthesia, surgery and BMI, the chances of hypothermia increases. [ABSTRACT FROM AUTHOR]