Introduction: Spinal anesthesia compared to general anesthesia is a safer method. Reduced headaches and back pain after spinal anesthesia, may cause more Selection of these method. In this study, the relationship between weight gain during pregnancy with headache and back pain after spinal anesthesia in patients undergoing cesarean section is checked.
 Materials & Methods: This study was performed on 100 patients for elective cesarean section. age, height, weight before pregnancy and during the cesarean section was recorded. Headache and back pain patients classified according to the score of VAS (Visual Analog Scale) that 0-10 are defined in the immediate postoperative recovery and discharge 1, 2, 6,12,24,48 hours after surgery was measured. Findings: Pearson correlation coefficients showed that there was a direct correlation between the weight gain during pregnancy and headache after spinal anesthesia in patients (p=0.047،r=0.20). Weight gain causes back pain decreased in patients, but the decrease was not statistically significant. (p=0.25 ،r=-0.11). In these cases there was no significant relationship between headache and back pain (p=0.68،r=0.45), between age of patient and severity of headache (p=0.025،r=0.80), height of patient and severity of headache (p=0.03،r=0.71), patient age and back pain (p=0.03،r=0.76), and the patient's height and back pain (p=0.05،r=0.55).
Discussion & Conclusion: Weight gain has an effect on the severity of the headache, but no effect on back pain intensity.