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A headache that improves or disappears on lying flat is a spinal headache. This happens when the CSF pressure in the brain falls. This usually happens after spinal anesthesia, spinal taps, or spinal injuries. However in some people this happens without a cause. This is known as spontaneous intracranial hypotension.
A procedure called an epidural blood patch, if is successful, even temporarily, it generally means the patient does indeed have a spinal headache. A small amount of the patient’s own blood is injected into the space between the dura and the bony spine known as the epidural space. If this causes temporary or permanent cure of headache, the diagnosis of spontaneous intracranial hypotension is confirmed.
However confirmed diagnosis cannot be given on net. Please discuss this with a neurologist. Hope this helps. Take care!
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