this trial will involve three groups. Group 1 will receive subthreshold stimulation. Group 2 will receive suprathreshold stimulation. Group 3 will receive shame treatment.

Inclusion Criteria:

• Age from 40 to 65 years old participated in this study, 2
• Having neck pain for more than 6 months with a grade five or greater on the visual analog scale
• Having one or more trigger points in the upper trapezius muscle,
• A significant increase in neck muscle EMG activity indicates the presence of tender points.

Exclusion Criteria:

• Taking non-pharmacological therapies (e.g., acupuncture, physical therapy, osteopathy)
• Taking oral or intravenous pain therapy, intramuscular or subcutaneous injection of cortisone, or local anesthetics during the study period,
• Presence of any contraindication to electrical current including pregnancy, epilepsy, cardiac arrhythmia, cardiac surgery, implanted pacemaker or defibrillator, previous surgery in the spinal cord, infectious diseases of the spinal cord, malignant tumors with or without secondary blastomas in the spinal cord, severe radicular pain with acute paralysis in the extremities