Motor Cortex Versus Insula Stimulation Using Transcranial Current Stimulation on Chronic Post-mastectomy Pain

Inclusion Criteria: * eighty patients within age group 18-65 years old with post mastectomy neuropathic pain that are resistant to medical treatment in the form of tramadol hydrochloride 100 mg twice daily, pregabalin 75 mg twice daily and Amitriptyline 25 mg once daily for at least two months or associated with significant adverse effect from medication will be involved in this study. Exclusion Criteria: * We will exclude patients with intracranial metallic devices or with pacemakers or any other device. We also exclude those with extensive myocardial ischemia and those known to have epilepsy