Metrorrhagia refers to irregular, non-cyclical uterine bleeding that occurs between menstrual periods or is unrelated to the normal menstrual cycle. Unlike menorrhagia (heavy but regular bleeding), metrorrhagia is characterized by unpredictable bleeding episodes. Possible Causes: Hormonal Imbalances Anovulation (lack of ovulation) Polycystic ovary syndrome (PCOS) Thyroid dysfunction Perimenopause Structural Abnormalities Uterine fibroids or polyps Adenomyosis Cervical or endometrial lesions Infections & Inflammation Pelvic inflammatory disease (PID) Endometritis Reproductive Conditions Endometriosis Ectopic pregnancy Miscarriage Medications & Contraceptives Hormonal birth control (IUDs, pills, implants) Anticoagulants