Menstruation
Understanding Heavy Menstrual Bleeding (Menorrhagia): Clinical Causes, Clotting, and Treatment
Soaking through pads hourly or passing large clots? Learn the medical definition of Menorrhagia, structural causes like fibroids, and modern non-surgical treatments.
TADr. Tasnim AraOB-GYN & Women's Health SpecialistAug 19, 20268 min readExpert reviewed
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Understanding Heavy Menstrual Bleeding (Menorrhagia): Clinical Causes, Clotting, and Treatment
“Key Takeaway: Heavy Menstrual Bleeding (HMB), historically classified as Menorrhagia, is clinically defined as menstrual blood loss exceeding 80 mL per cycle or bleeding persisting for >7 consecutive days, causing demonstrable physical, emotional, and material impairment. Rooted in the FIGO PALM-COEIN classification, excessive volume results from structural uterine lesions (Leiomyomas, Polyps, Adenomyosis) or non-structural hemostatic and ovulatory defects. First-line medical therapy with antifibrinolytic agents (Tranexamic Acid) and the Levonorgestrel-releasing Intrauterine System (LNG-IUS) reduces blood loss by 40% to 90%, preserving fertility and preventing surgical hysterectomy.
1. Endometrial Hemostatic Physiology & Pathogenesis of HMB
Menstrual volume control depends on precise microvascular hemostasis:
- Impaired Endometrial Fibrinolysis & Prostaglandin Balance: Under normal physiological conditions, local plasminogen activators degrade fibrin clots to allow controlled shedding. In idiopathic HMB and submucosal fibroids, excessive local tissue plasminogen activator (t-PA) synthesis accelerates fibrin degradation, while an elevated PGE2 to PGF2a ratio induces local arteriolar vasodilation.
- Submucosal Leiomyoma Disruption: Fibroids located in the submucosal space distort the endometrial cavity architecture, increase the total surface area for shedding, and secrete angiogenic growth factors (bFGF, VEGF) that produce fragile, hyperdilated venules incapable of normal vasoconstriction.
- Chronic Iron-Deficiency Anemia: Progressive depletion of storage ferritin (<15–30 ng/mL) reduces erythrocyte cellular oxygenation, precipitating resting tachycardia, dyspnea on exertion, and cognitive lethargy.
2. Pharmacological & Diagnostic Algorithm for HMB
Objective Blood Loss >80 mL / Soaking Hourly Absorbents
1Complete Blood Count + TVS / Saline Infusion Sonography
2Antifibrinolytics: Tranexamic Acid (1 g TID during flow)
3Prostaglandin Inhibitors: Mefenamic Acid (500 mg TID)
4Local Progestin: Levonorgestrel Intrauterine System (Mirena)
5Structural Excision: Hysteroscopic Polypectomy / Myomectomy
3. Summary Table: Clinical Interventions & Therapeutic Efficacy Matrix
| Therapeutic Modality | Mechanism of Action | Expected Blood Loss Reduction | Clinical Indication |
|---|---|---|---|
| Tranexamic Acid (Oral) | Reversible lysine-site blockade of plasminogen | 40% to 50% reduction | First-line non-hormonal therapy for acute/chronic flow |
| Mefenamic Acid (NSAID) | Cyclooxygenase inhibition & PGE2 reduction | 20% to 40% reduction | Concurrent dysmenorrhea with moderate menorrhagia |
| Levonorgestrel IUS (52 mg) | Profound endometrial glandular atrophy | 70% to 90% reduction | Gold standard medical therapy; preserves uterus |
| Combined Oral Contraceptives | Suppresses hypothalamic-pituitary-ovarian axis | 35% to 50% reduction | Patients requiring concurrent reliable contraception |
“🩺 Physician's Note: Patients with refractory menorrhagia presenting with hemodynamic instability, symptomatic orthostatic hypotension, or hemoglobin <7 g/dL require immediate hospital admission, intravenous fluid resuscitation, high-dose intravenous tranexamic acid, and potential packed red blood cell transfusion.
About the authorExpert reviewed
Dr. Tasnim Ara
OB-GYN & Women's Health Specialist
Dedicated to creating evidence-based, compassionate health resources for women through every stage of life.
Medically reviewed. This story was checked against current clinical guidance by the Femevia medical board. It is educational — always speak with your own clinician about your care.
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