Abnormal Uterine Bleeding (ACOG FAQ095)

Tier 1: Established: peer-reviewed research or government health authority
Publisher: American College of Obstetricians and Gynecologists · Published: September 4, 2026 · Accessed: September 4, 2026

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• Abnormal uterine bleeding is bleeding that differs from a woman's usual pattern - heavier, longer, or between periods - and deserves evaluation rather than being written off.
• Evaluation of abnormal uterine bleeding can include an endometrial biopsy, in which a small sample of tissue is taken from the lining of the uterus and sent to a lab for testing.
• When abnormal bleeding happens after menopause, or in a woman whose bleeding pattern has changed in a way that needs ruling out, sampling the endometrium is a standard part of the workup.