The purpose of this study is the evaluation of the degree of post-injection soreness and autonomic symptoms after trigger point injection in patients with trigger points. We divided the subjects of the study into four groups such as, 2% lidocaine injection, normal saline injection, dry needling only, and dry needling with electrical stimulation group, including 20 patients, and measured the visual analog scale(VAS) before treatment and after treatment.

Before treatment, the VAS mean scores were 6.0±1.16 in dry needling with electrical stimulation group, 6.6±1.35 in dry needling group, 6.8±1.28 in lidocaine injection group, and 6.4±1.08 in normal saline injection group(p=0.1447). In postinjection 3rd day, the VAS mean scores were 0.8±0.63 in dry needling with electrical stimulation group, 1.7±1.08 in dry needling group, 1.6±1.53 in lidocaine injection group, and 4.3±1.11 in normal saline injection group(p=0.0001). As a result, dry needling with electrical stimulation group showed less post-injection soreness and better effect than other groups.