: The primary objective of this prospective, randomized, double-blind, placebo-controlled clinical trial is to evaluate whether repetitive bilateral greater occipital nerve (GON) blockade administered with a local anesthetic (0.5% bupivacaine) significantly reduces headache severity, attack duration, and the number of pain days in female patients with menstrual migraine compared to a placebo group (normal saline). Patients will receive injections twice a month for three months (seven days before the expected onset of menstruation and on the first day of menstruation).