tDCS and Pain Associated With Diabetic Neuropathy

Inclusion Criteria: * Patient diagnosed with painful diabetic peripheral neuropathy (PDPN) components with DN4 score ≥ 4/10, and chronic pain with an intensity of at least VAS\> 4/10. * Onset of neuropathic PDPN pain for at least 6 months. * Pain intensity as measured by VAS\> 4/10 in the week preceding inclusion in the study. * drug-resistant patients who have no pain reduction of 50% or an improvement of at least 2 points in the Patient Global Impression of Change, having used all the classes of drugs indicated as a first, second or third line. * Absence of glycemic de-compensation with HbA1c values \<9% in the previous 6 months. * Stability of glycemic control with changes in HbA1c in the last 6 months of less than 2%. Exclusion Criteria * Neurological comorbidities. * Presence of contraindications to the use of electrotherapy (pacemaker, epilepsy, etc ...). * Pregnancy. * Previous neurosurgical interventions. * psychiatric conditions. * Cognitive impairments ( Mini-Mental Status exam (MMSE) \<24). * Presence of red flags for pain: tumors, spine fractures, non-neuropathic pain difficult to distinguish from that of the PDPN, neuropathic pain from a cause other than the PDPN. * Severe comorbidities such as advanced renal failure, heart failure, respiratory failure.