In part 1 of the project clinical effect of specific neck rehabilitation for unilateral
headache and neck pain (also termed cervicogenic headache) will be compared with standard
primary health care. The researchers will further study whether fear avoidance beliefs and
self-efficacy predict long term neck function and headache frequency superior to active range
of neck movement. Part 2 will investigate whether patients with cervicogenic headache have
structural changes in cerebral grey and white matter and in connectivity of the resting state
state network, and whether these are reversed after effective neck rehabilitation and
correlate to symptom severity and degree of disability.