Effect of spinal needle size on headache after cesarean section

INTERVENTION: Intervention 1: Intervention group: In the intervention group, spinal anesthesia will be performed using a 25‐gauge Quincke needle. Intervention 2: Control group: In the control group, spinal anesthesia will be performed using a 22‐gauge Quincke needle. CONDITION: Post‐dural puncture headache. PRIMARY OUTCOME: Incidence of post‐dural puncture headache. Timepoint: Each patient will be evaluated daily for five consecutive days after the C/S, either in person or via telephone follow‐up. Method of measurement: International Classification of Headache Disorders (ICHD) criteria. SECONDARY OUTCOME: Adverse effects of the intervention. Timepoint: Each patient will be evaluated daily for five consecutive days after the C/S, either in person or via telephone follow‐up. Method of measurement: A structured postoperative follow‐up form. Onset time of post‐dural puncture headache. Timepoint: Each patient will be evaluated daily for five consecutive days after the C/S, either in person or via telephone follow‐up. Method of measurement: A structured postoperative follow‐up form. Severity of post‐dural puncture headache. Timepoint: Each patient will be evaluated daily for five consecutive days after the C/S, either in person or via telephone follow‐up. Method of measurement: Visual Analog Scale. INCLUSION CRITERIA: Pregnant women aged 18‐45 years Scheduled for elective C/S American Society of Anaesthesiologists (ASA) grade I or II Singleton pregnancy Eligible for spinal anesthesia Successful spinal anesthesia on first needle insertion Ability to understand and provide written informed consent