Final answer:
Post dural puncture headache is caused by the leakage of cerebrospinal fluid from the puncture site during a lumbar puncture procedure.
Step-by-step explanation:
The etiology of post dural puncture headache is related to the leakage of cerebrospinal fluid (CSF) from the puncture site. Post dural puncture headache can occur after a lumbar puncture, also known as a spinal tap, which is a procedure where CSF is removed through a needle inserted into the lower part of the spinal canal. When CSF leaks from the puncture site, it can lead to a decrease in CSF pressure, causing the blood vessels in the brain to dilate and result in headache.