Effects of Transcutaneous and Percutaneous PTNS on Idiopathic OAB

Inclusion Criteria: * Female and male * Age \>18 years * Complaint urge urinary incontinence (3 or more episodes per week) OR overactive bladder (8 or more voids per day, and/or 2 or more voids per night) * Urodynamic data of overactive detrusor * Failed trial of conservative therapy (bladder training, fluid modification, diet modification, caffeine restriction, pelvic floor training) * Failed trial of anticholinergic either due to inability to take the medication, adverse reaction to medication, or no improvement on medication * Willing to complete study questionnaires and informed consent study Exclusion Criteria: * Presence of bladder obstruction (prostate or prolapse) * Neurogenic bladder overactivity * Previous pelvic organ prolapse surgery * Unwilling and mentally incompetent to participate in study * Pregnancy or planning to become pregnant during the study * Presence of urinary fistula * Recurrent or current urinary tract infection (5 or more infections in the last 12 months) * Bladder stones * Bladder cancer or suspected bladder cancer * Hematuria * Central or peripheral neurologic disorders such as Multiple Sclerosis, Parkinson's disease, spina bifida, or other spinal cord lesion * Metal implants such as pacemaker, implantable defibrillator, or metal implants where PTNS or TENS device needs to be placed (sacrum or ankle/leg). * Uncontrolled diabetes and diabetes with peripheral nerve involvement * Anticoagulants treatment * Current use of anticholinergics or use within the last 4 weeks * Current use of botox bladder injections or bladder botox injection within the last year * Current use of interstim therapy or currently implanted interstim device or leads * Urinary retention or gastric retention * Painful Bladder Syndrome/Interstitial Cystitis * Previous PTNS treatment