Orthostatic headache
Encyclopedia
Orthostatic headache is a medical condition in which a person develops a severe headache
Headache
A headache or cephalalgia is pain anywhere in the region of the head or neck. It can be a symptom of a number of different conditions of the head and neck. The brain tissue itself is not sensitive to pain because it lacks pain receptors. Rather, the pain is caused by disturbance of the...

 while vertical and the headache is relieved when horizontal.

Causes

There exist many reasons for orthostatic headaches. One reason is a spontaneous cerebrospinal fluid leak
Spontaneous cerebrospinal fluid leak
Spontaneous cerebrospinal fluid leak syndrome is a medical condition in which the cerebrospinal fluid held in and around a human brain and spinal cord leaks out of the surrounding protective sac, the dura, for no apparent reason...

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