Guided Imagery and Transcranial Direct Current Stimulation (tDCS) in Women With Chronic Pelvic Pain

Inclusion Criteria: * Female * Age 18 to 64 years * Women must either be unable to become pregnant (are surgically sterile or postmenopausal) or must use an approved method of birth control throughout the study period. * Self- reported CPP defined as pelvic pain that is non-cyclical and of at least 6 months duration and refractory to other treatments * Subject agrees to not start any new treatment (medication or otherwise) throughout the study treatment and follow up periods. * Subject agrees to maintain stable doses of all current medications throughout the study treatment and follow-up period. Exclusion Criteria: * Pacemaker * History of seizures during the last 2 years or diagnosis of epilepsy * Currently using tobacco * Parkinson's Disease * Any condition, including neurological or psychiatric illness, which per investigators' judgement may increase subject risk * History of Hunner's lesion in the medical record * Lactation, pregnancy, or refusal to use medically approved/reliable birth control in women of child-bearing potential * Sacral, pudendal Interstim® or spinal cord stimulator that is "on". * Contraindications to tDCS stimulation (e.g. metal in the head, implanted brain medical devices, scalp wounds or infections, etc.) * History of head injury resulting in more than a momentary loss of consciousness during the last 2 years Note: For the sake of preserving scientific integrity, one or more of the eligibility criteria have been left off the list posted while the trial is ongoing. A full list of eligibility criteria will be posted upon completion of the trial.