• Diagnosis of cervicogenic headache according to the ICHD-3 criteria:

• A. Any headache fulfilling criterion C B. Clinical and/or imaging evidence1 of a disorder or lesion within the cervical spine or soft tissues of the neck, known to be able to cause headache2

• C. Evidence of causation demonstrated by at least two of the following:

⁃ headache has developed in temporal relation to the onset of the cervical disorder or appearance of the lesion

⁃ headache has significantly improved or resolved in parallel with improvement in or resolution of the cervical disorder or lesion

⁃ cervical range of motion is reduced, and headache is made significantly worse by provocative manœuvres

⁃ headache is abolished following diagnostic blockade of a cervical structure or its nerve supply D. Not better accounted for by another ICHD-3 diagnosis3;4;5.

∙ Age: 18-65 years

‣ Headache for at least 1 day/week for at least 3 months

‣ Limited mobility of the neck

‣ Positive flexion-rotation test (\<32 degrees on the left/right side or a difference of 10 degrees or more between left and right side)

‣ NRS \> 3/10