The purpose of this study is to determine the effect of Thai massage on electromyogram in patients with chronic upper back pain associated with myofascial trigger points.

Inclusion Criteria:

• Male or female
• Age between 18 - 50 years old
• The participants have experienced spontaneous upper pain for longer than 12 weeks (chronic) and that at least one trigger point will be present in the s trapezius muscles. Trigger points will be diagnosed as the presence of focal tenderness in a taut band and with pain recognition.
• The participants will be able to follow instructions.
• Good communication and cooperation.

Exclusion Criteria:

• A history of the following diseases or disorders:
• Cervical radiculopathy
• Contraindications of traditional Thai massage
• Contagious skin disease
• Injury or inflammation of muscle
• Bone fracture and/or joint dislocation
• Open wound
• Uncontrolled hypertension
• Drug and/or alcohol intoxication