Because they have yet to pass national legislation protecting the chiropractic profession, Japanese DCs are in a similar situation that U.S. DCs faced. We were fortunate enough to be able to pass chiropractic licensure state by state. The DCs in Japan must accomplish this nationally, which has proved to be an extremely difficult task. And in spite of their efforts, Japanese DCs are currently faced with two chiropractic professions.
Prevalence of Cervicogenic Headache
Headache is a common problem affecting 16 percent of the population at any given time. What percentage of headaches are of cervicogenic origin?
General Population -- 2.5%
Headache Sufferers (=> 5 days/mo) -- 17.8%
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Nilsson N. The prevalence of cervicogenic headache in a random population sample of 20-59 year olds. Spine 1995;20:1884-1888.