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

Patients will receive 2000 shocks, 1 bar (energy flux density 0.045 mj/mm2) at frequency 10 MHz on upper trapezius trigger points plus strengthening and stretching exercises for upper trapezius.

patients will receive 2000 shock with 4 bars (Energy flux density 0.18 mj/mm2) at frequency 10 MHz on upper trapezius trigger points plus strengthening and stretching for upper trapezius

patients will receive 2000 shock with energy flus density 0.00 on upper trapezius trigger points plus strengthening and stretching exercise for upper trapezius.