The main study is a randomized controlled trial enrolling patients with chronic migraine and medication overuse (MoH). Participants will undergo a standardized in-hospital detoxification protocol and will be randomly assigned to one of three parallel groups to receive either sham stimulation, active repetitive transcranial magnetic stimulation (rTMS) applied over the motor cortex face representation, or active rTMS applied over the motor cortex forearm representation. Stimulation will be delivered for five consecutive days.
Clinical, sensory (Quantitative Sensory Testing, QST), and biochemical measures (plasma glutamate, serotonin, and calcitonin gene-related peptide, CGRP) will be collected at baseline and during follow-up.
