The investigators will recruit 72 patients with at least one trigger point in the upper trapezius muscles and a clinically confirmed diagnosis of myofascial pain syndrome (MAS) (according to Travell-Simons' criteria) admitted to the physical medicine and rehabilitation outpatient clinic.~Age, gender, occupation, medications, duration of diagnosis, body mass index, comorbidity, functional status and pain of these patients will be questioned. Patients will be randomly divided into three groups. A total of 3 consecutive weeks of treatment were planned.
In this study, the investigators planned to compare local anesthetic injection added to stretching exercise, ozone injection treatment added to stretching exercise, and only stretching exercise in patients with upper trapezius muscle myofascial pain syndrome.