Dose Related Effects of Radial Extracorporeal Shock Wave Therapy on Upper Trapezius Trigger Points in Patients With Cervicogenic Headache.

Inclusion Criteria: * Symptoms of mechanical neck pain lasting for more than three months * Skeletal muscle with a palpable taut band * Hypersensitive point inside the taut band with the ability to reproduce referred pain when the sensitive spot is palpated, * Joint soreness in at least one of the upper cervical spine's joints (c1-c3) * Unilateral discomfort that originates in the neck and radiates to the frontotemporal area * Pain that is made worse by moving the neck * Headaches that occur at least once a week for a duration longer than three months. Exclusion Criteria: * Other primary headaches (i.e., migraine, tension-type headache) * Bilateral headaches, * Other defined cervical problem such as fracture, dislocation, skin disease, illness that is inflammatory, neural illness, vertebrobasilar insufficiency, a birth defect, tumor, or infection.