Study of the Acute Effects of Guided Imagery and tDCS on Pain Levels in Women With Chronic Pelvic Pain

Inclusion Criteria: * Female * Age 18 to 64 years * Women must either be unable to become pregnant (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 not related to menstrual cycle and of at lease 6 months duration and refractory to other treatments. * Subject agrees to not start any new treatments (medication or otherwise) throughout the study participation. * Subject agrees to maintain stable doses of all current medications throughout study participation. Exclusion Criteria: * History of seizures during the last 2 years or diagnosis of epilepsy * Pacemaker * Use of carbamazepine, oxcarbazepine, phenytoin, pramipexole or cabergoline within the past 6 months as self-reported * Parkinson's Disease * Any condition, including neurological or psychiatric illness, which per investigators' judgment, may increase subject risk * History of Hunner's lesions * Lactation, pregnancy, or refusal to use medically approved/reliable birth control in women of child-bearing potential * Sacral or 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 Deferral Criteria 1. If a subject has a confirmed UTI, she will be deferred until treatment is completed and symptoms resolve 2. Participating in another intervention study, or received an investigational drug or device within 4 weeks prior to screening 3. Subject received bladder hydrodistention within the past 12 weeks 4. Within the past 4 weeks, initiation of any new medications or any intravesical treatment for treatment of IC/BPS 5. Within the past 24 weeks received any surgery or procedure which may impact the pelvic floor 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.