In part 1 of the project clinical effect of specific neck rehabilitation for 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.