Adenomyosis is a gynecological condition characterized by the presence of endometrial glandular and stromal tissue within the uterine myometrium. As a research concept, it investigates the etiology, pathogenesis, clinical manifestations, diagnostic modalities, and therapeutic interventions related to this ectopic endometrial tissue, exploring its impact on uterine function, pelvic pain, abnormal uterine bleeding, and reproductive outcomes.