Transcranial Direct Stimulation in Chronic Pelvic Pain

Inclusion Criteria: 1. Providing informed consent to participate in the study 2. 18 to 64 years old 3. Having symptoms of pelvic pain for more than 6 months with an average of 3 on a 0-10 VAS scale (for pelvic pain subjects only) 4. No history of or current genitourinary tuberculosis as self reported 5. No history of urethral cancer as self reported 6. No history or current bladder malignancy, high grade dysplasia or carcinoma in situ as self reported 7. No occurrence of ovarian, vaginal or cervical cancer in the previous 3 years as self reported 8. No current vaginal infection as self reported 9. No active herpes in previous 3 months as self reported 10. No antimicrobials for urinary tract infections in previous 3 months as self reported 11. Never treated with cyclophosphamide as self reported 12. No radiation cystitis as self reported 13. No neurogenic bladder dysfunction (due to a spinal cord injury, stroke, Parkinson's disease, multiple sclerosis, spina bifida or diabetic cystopathy) as self reported 14. Absence of bladder, ureteral or urethral calculi for previous 3 months as self reported 15. No urethritis for previous 3 months as self reported 16. No urethral dilatation, cystometrogram, bladder cystoscopy with full anesthesia or bladder biopsy in previous 3 months as self reported 17. Must not be pregnant 18. Eligible to MRI according to MRI screening checklist 19. No contraindications to tDCS: 20. No history of alcohol or drug abuse within the past 6 months as self reported 21. No use of carbamazepine as self reported 22. Does not have severe depression (with a score of \>30 in the Beck Depression Inventory) 23. No history of neurological disorders as self reported 24. No history of unexplained fainting spells as self reported, 25. No history of head injury resulting in more than a momentary loss of consciousness as self reported 26. Have had no neurosurgery as self reported 27. No history of psychological disorders as self reported 28. Must have the ability to feel pain as self reported