The document discusses the new FIGO classification system for abnormal uterine bleeding (AUB). It introduces the PALM-COEIN system which provides a standardized terminology and classification. The system categorizes AUB into structural causes (polyps, adenomyosis, leiomyoma, malignancy) and non-structural causes (coagulopathy, ovulatory dysfunction, endometrial, iatrogenic, not yet classified). It provides guidelines for evaluation and outlines the notation system for documenting multiple contributing factors to a patient's AUB. The standardized classification aims to improve management of AUB internationally through a unified terminology and focus on appropriate treatment concepts.