Primary dysmenorrhea (PD) is a painful menstruation due to contractions in the uterus that induce ischemic pain associated with normal pelvic anatomy. The aim of the study is to evaluate the effect of High frequency Transcutaneous Electrical Nerve Stimulation (TENS) application at root level and dermatome level among adolescent girls and to compare the effect of high frequency TENS at dermatome level and root level among adolescent girls with Primary dysmenorrhea. 210 adolescent girls were included with 14-19 years of age and randomly allocated into three groups of High TENS (dermatome level), High TENS (root level) and Control group. The measurement of outcome variables such as lower abdominal pain, referred low back pain, and referred bilateral thigh pain was performed by numerical pain rating scale and measurement of systolic as well as diastolic blood pressure by aneroid sphygmomanometer. The data collection was done before and after the intervention. The within group analysis of outcome variables was performed by Analysis of variance test (ANOVA) in all three groups. The between group comparison of outcome variables was analyzed by Analysis of variance test (ANOVA). Tukey's post hoc pairwise comparison was also applied to identify the statistical pairwise mean difference between all three groups. There were overall highly significant differences within group and between group comparison of all the outcome variables in group A (p value <0.05). The study concluded that High frequency TENS application at the dermatome level shows significant improvement for managing primary dysmenorrhea.

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