Optimal Frequency Used in Transcutaneous Electrical Nerve Stimulation (TENS) for Treating Pelvic Pain in Adults

TENS (transcutaneous electrical nerve stimulation) is accepted as a standard treatment for chronic pelvic pain, but the best settings to recommend, including frequency of stimulation, have not been defined to date. This study aims to find the optimal frequency, also known as cycles per second or Hertz (Hz) for treating chronic pelvic pain using non-invasive skin-level electrical nerve stimulation. The investigators will see how people respond to (20Hz, 50Hz or 100Hz). The study will have a two week control period (one week that looks back retrospectively at the week prior and another week looking prospectively at the patient symptoms) with no TENS unit and the participants normal standard of care treatments. This will be followed by 2 weeks of active TENS treatment for 30 minutes a day at the most painful time of day for the participant. The participant will also be allowed to extend their trial to study for durability for up to 3 additional months after the initial study. Participants will be asked to fill out a VAS (visual analog scale), GUPI (genitourinary pain index) and TENS usage log weekly.