Study aim: Determination of the effect of rectal diclofenac suppository prophylaxis on shivering after cesarean section Design: Study Design: Double-blind randomized controlled trial Two parallel groups (intervention vs placebo) Single-center study Sample Size: 100 total participants (50 per group) Calculated based on: Type I error (α) = 0.05 Power = 80% Expected minimum difference of 25% in post-anesthesia shivering between groups Randomization: Simple randomization method Individual-level randomization (not cluster) Computer-generated random numbers Double-blinding implemented (both patients and post-operative observers are blinded to group allocation) Study Groups: Intervention Group: Receives 100mg rectal diclofenac suppository 10 minutes before surgery Standard anesthesia protocol Control Group: Receives placebo suppository 10 minutes before surgery Same standard anesthesia protocol Settings and conduct: This double-blind randomized controlled trial will be conducted at a single center. The study will involve women aged 18-40 years undergoing cesarean section with ASA status I or II. The operating room temperature will be maintained at 22-24°C throughout the procedures. Participants/Inclusion and exclusion criteria: Inclusion Criteria: Women aged 18-40 years Undergoing cesarean section ASA status I or II Willing to participate in the study Exclusion Criteria: Allergy to diclofenac Cardiovascular disease Hypertension Diabetes Kidney disease Chronic lung disease Liver disease History of alcohol consumption Body temperature below 36°C Body temperature above 38°C Intervention groups: Receives 100mg rectal diclofenac suppository 10 minutes before surgery Main outcome variables: Determination of the effect of rectal diclofenac suppository prophylaxis on shivering after cesarean section