NESA Neuromodulation Versus Transcutaneous Posterior Tibial Stimulation

Inclusion Criteria: * Minimum criteria for a primary diagnosis of overactive bladder who have or have not received active/alternative treatments for this pathology. * Patients with previous pharmacological treatments that have not obtained an adequate clinical response. * Patients whose cognitive abilities are competent to participate in the study and are able to complete the study questionnaires and have given written consent to participate in the study. * Without further contraindications for electrotherapy treatment such as serious use of pacemakers, pregnancy, internal bleeding, poor skin condition (ulcerations, wounds...) and/or phobia of electricity. Exclusion Criteria: * Presence of urinary fistula. * Infections in the last 12 months. * Haematuria during the trial period. * Pregnancy or plans to become pregnant during the study. * Pathology of the central or peripheral nervous system (multiple sclerosis, Parkinson's disease, etc.). * Uncontrolled diabetes. * Currently treated with Botox injections for the bladder or within the last year. * Current treatment with interstim or currently implanted interstim device. * Bladder outlet obstruction. * Urinary retention. * Treatment with more than two antidepressants and/or multiple benzodiazepines, as well as antiepileptics. * Contraindications for electrotherapy treatment.