Abnormal Uterine Bleeding

Structural causes, including polyps, adenomyosis, leiomyomas, and malignancy, alter the uterine corpus or endometrium in ways that can disturb normal shedding or bleeding control. Nonstructural causes, such as ovulatory dysfunction, coagulopathy, or medication effects, interfere with hormonal timing, hemostasis, or both. Distinguishing these categories helps organize the diagnostic evaluation.

The endometrium must shed in a coordinated way and then achieve hemostasis, meaning effective control of bleeding. Abnormal uterine bleeding can arise when either process is disrupted by structural disease, altered ovulation, impaired coagulation, or medication effects. Considering these mechanisms helps clinicians connect the bleeding pattern with possible underlying causes rather than treating the symptom in isolation.

Classification separates conditions that may require different management and levels of concern. A benign structural abnormality, an ovulatory problem, a coagulation disorder, and malignancy do not carry the same implications or treatment needs. Accurate categorization also helps identify patients at risk of anemia, impaired quality of life, or serious underlying disease that warrants further assessment.

Evaluation begins with a detailed menstrual history, including changes in regularity, timing, frequency, duration, and volume. Clinicians then incorporate pregnancy testing, physical examination, laboratory studies, and imaging as appropriate to the presentation. Combining these sources helps determine whether the pattern reflects a structural abnormality, a nonstructural process, or another clinically important cause.

Each component contributes different evidence. Pregnancy testing helps assess an important clinical context, while laboratory studies can support evaluation of systemic contributors such as coagulopathy. Imaging assists in identifying structural abnormalities of the uterine corpus. Used alongside history and examination, these tools improve classification and help direct subsequent management.

Assessment is important when bleeding changes are associated with potential anemia, reduced quality of life, or concern for serious underlying disease. The workup provides information needed to match treatment with the identified cause rather than relying only on symptom control. In medical practice, this approach supports both relief of consequences and recognition of conditions requiring further attention.