Effect of Multitarget tDCS for Neuropathic Pain

Inclusion Criteria: 1. Female or males aged between 18 and 75 years. 2. Pain fulfilling the criteria for probable or definite neuropathic pain and scoring ≥4/10 at Douleur Neuropathique 4 Questions. 3. Pain duration of at least 3 months and average pain intensity scoring ≥4/10 at Numeric Rating Scale. 4. Stable pharmacological treatment for at least 4 weeks prior to the study and throughout the trial. 5. Informed consent obtained. Exclusion Criteria: 1. Pregnancy or lactation. 2. Active central nervous system diseases including but not limited to brain tumour, intracranial hypertension, past or current epilepsy. 3. Unable to complete the questionnaire due to language abilities or reduced cognitive functioning. 4. Alcohol or substance abuse. 5. Common contraindications for transcranial direct current stimulation including but not limited to skull defect, implanted device or metal in the brain, severe cardiopulmonary, renal or hepatic diseases. 6. Unwilling to comply with the treatment or follow-up assessments. 7. Participating in another clinical trial within 3 months prior to enrollment of this clinical trial. 8. Any patient deemed unsuitable for enrollment by the investigators.