An epidural blood patch is when a small amount of blood is used to seal a puncture site in the spine as a result of a spinal tap procedure. The patch helps restore normal pressure in the spinal fluid.

Spinal Tap
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This procedure is done to relieve a spinal headache that does not go away on its own. A spinal headache can develop after a spinal tap procedure when too much spinal fluid leaks internally and reduces pressure in the spine.

This procedure is quite common and relief is often immediate.