“…Headache and musculoskeletal symptoms are common complaints in the general population (Rasmussen et al, 1991;Hasvold et al, 1996), and more frequent amongst women than men. Some population-based (Rafnsson et al, 1989;Hasvold et al, 1996) and several clinicbased studies (Lebbink et al, 1991;Kidd and Nelson, 1993;Blau et al, 1994;Lipchik et al, 1997;Marcus et al, 1999;Persson and Carlsson, 1999) have reported a positive association between headache and musculoskeletal discomfort localized in the upper body area. To which degree musculoskeletal symptoms in other locations are associated with headache is not known, but high headache prevalence rates have also been found in patients suffering from low back pain (Ahern et al, 1988;Duckro et al, 1994).…”