Effect of Altitude on Postdural Puncture Headache After Caesarean Delivery

Inclusion Criteria: * Parturient, aged more than or equal to 18 years * American society of Anesthesiologist 2 and 3 * Scheduled for elective and non-elective (category 2 \& 3) caesarean delivery with spinal anesthesia * Native to their resident altitude i.e., those born, raised, and have continuously lived at the same altitude, at least for the past 1 year. Exclusion Criteria: * Hypertensive disorder * Cerebrovascular disease * Mental disorder (schizophrenia and other psychotic disorders) * Known fetal anomalies * Contraindication to spinal anaesthesia. * Those requiring general anaesthesia for delivery due to failed spinal anesthesia * Major post-delivery complications (severe haemorrhage, sepsis, or ICU admission) * Those who migrate from their resident altitude (either low to high or vice versa) within 7 days post-delivery will also be excluded.