Headaches that start in the back of the skull and upper neck; usually spurred (or increase in intensity) by valsalva maneuvers, such as: coughing, sneezing, heaving, laughing, etc.
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Craniocervical Instability [CCI]
A structural defect and vertical hypermobility (back and forth sliding) of the craniocervical junction (interface between the occipital bone and the 1st and 2nd vertebrae) which can lead to a deformation of the brain stem, upper spinal cord and cerebellum (and associated neurological symptoms) due to compression.
Etiological Co-factors: Heritable Disorders of Connective Tissue (HDCT), such as Ehlers-Danlos Syndrome (EDS).
