I am a premenopausal woman with menorrhagia who experiences light‑headedness, dyspnea, and headache on exertion; what is the likely diagnosis and what work‑up and treatment are recommended?

Iron Deficiency Anemia from Menorrhagia

You have iron deficiency anemia caused by heavy menstrual bleeding, and you need immediate oral iron supplementation plus evaluation for the underlying cause of your menorrhagia. 1, 2, 3

Immediate Treatment Protocol

Start ferrous sulfate 200 mg (65 mg elemental iron) once daily on an empty stomach right now—do not wait for further testing. 2 Your severely low iron saturation of 8.49% and ferritin of 11 ng/mL confirm profound iron depletion requiring urgent replacement. 1, 2

Optimizing Iron Absorption

• Add vitamin C (ascorbic acid) 500 mg with each iron dose to dramatically enhance absorption, which is critical given your severely depleted iron stores. 2
• Take iron on an empty stomach for best absorption; if you develop nausea or constipation, taking it with food is acceptable. 2
• Avoid tea and coffee within 1 hour of your iron dose, as these strongly inhibit absorption. 2
• If ferrous sulfate causes intolerable gastrointestinal side effects after trying it for 1-2 weeks, switch to ferrous fumarate or ferrous gluconate—they are equally effective. 2

Expected Response and Monitoring

• Your hemoglobin should rise by approximately 2 g/dL after 3-4 weeks of treatment. 2 Check your hemoglobin at 4 weeks to confirm response.
• Continue oral iron for 3 months after your hemoglobin normalizes to fully replenish your iron stores—total treatment duration is typically 6-7 months. 2
• If your hemoglobin fails to rise by at least 1 g/dL after 4 weeks, this indicates either poor compliance, ongoing blood loss exceeding replacement capacity, or malabsorption requiring switch to intravenous iron. 2

Addressing Your Menorrhagia

Your heavy menstrual bleeding is the root cause and must be treated simultaneously with iron replacement. 3, 4 Menorrhagia accounts for iron deficiency in 5-10% of premenopausal women, and African American women have particularly high rates of both menorrhagia and iron deficiency. 3, 5

Immediate Gynecologic Evaluation

• Schedule urgent gynecology consultation for bleeding control, which may require hormonal therapy (combined oral contraceptives or levonorgestrel IUD) or surgical intervention depending on the cause. 4
• Pregnancy testing is mandatory before any intervention, regardless of contraceptive use or sexual history. 4
• Pelvic ultrasound to evaluate for structural causes of bleeding (fibroids, polyps, adenomyosis). 6, 7

Medical Management Options for Menorrhagia

• First-line hormonal options include combined oral contraceptive pills or levonorgestrel-releasing intrauterine device, both of which significantly reduce menstrual blood loss. 7, 4
• Tranexamic acid is a non-hormonal alternative that reduces bleeding by 40-50% during menses. 7
• NSAIDs (ibuprofen, naproxen) taken during menses reduce bleeding by 20-30%. 7

Essential Diagnostic Workup

Screen for Celiac Disease

All premenopausal women with iron deficiency anemia must be screened for celiac disease, which is found in 3-5% of cases and causes iron malabsorption. 1, 3 Request:

• Tissue transglutaminase antibody (tTG-IgA)
• Total IgA level (to exclude IgA deficiency which causes false-negative celiac testing) 1

Rule Out Other Causes

• Urinalysis or urine microscopy to exclude urinary tract bleeding. 1
• Stool for occult blood if you have any gastrointestinal symptoms (abdominal pain, bloating, diarrhea, constipation). 1, 8

When Gastrointestinal Investigation Is Needed

You do NOT need upper endoscopy or colonoscopy at this time because you are under age 45, premenopausal, and have an obvious source of blood loss (menorrhagia) without upper GI symptoms or family history of colon cancer. 1, 9, 3 However, GI evaluation becomes necessary if:

• You have upper GI symptoms (heartburn, nausea, abdominal pain, bloating). 1, 8
• You have a first-degree relative with colon cancer diagnosed before age 50. 9
• Your anemia fails to respond to iron therapy after 4 weeks despite good compliance. 1, 2
• You have positive stool occult blood testing. 1

When to Switch to Intravenous Iron

Consider IV iron if you meet any of these criteria:

• Intolerance to at least two different oral iron preparations (ferrous sulfate, ferrous fumarate, ferrous gluconate). 2
• Failure of your ferritin to improve after 4 weeks of adherent oral therapy. 2
• Ongoing menstrual blood loss so heavy that it exceeds oral iron replacement capacity. 2
• Positive celiac serology with inadequate response to oral iron despite gluten-free diet. 2

Preferred IV iron formulations that replace your deficit in 1-2 infusions include ferric carboxymaltose (750-1000 mg per 15-minute infusion) or ferric derisomaltose (1000 mg single infusion). 2, 10 These are safer and more convenient than older iron dextran formulations. 2

Understanding Your Symptoms

Your constellation of symptoms—lightheadedness with activity, shortness of breath with exertion, headache with exertion—are classic manifestations of severe anemia. 1, 5 These symptoms occur because your tissues are not receiving adequate oxygen due to low hemoglobin. They will improve as your hemoglobin rises with iron replacement, typically within 3-4 weeks. 2

Critical Pitfalls to Avoid

• Do not take multiple doses of iron per day—once-daily dosing is superior because hepcidin (the hormone regulating iron absorption) remains elevated for 48 hours after each dose, blocking additional absorption and increasing side effects. 2
• Do not stop iron therapy when your hemoglobin normalizes—you must continue for an additional 3 months to replenish your iron stores. 2
• Do not delay treatment of your menorrhagia while focusing only on iron replacement—both must be addressed simultaneously for lasting improvement. 3, 11
• Do not overlook vitamin C supplementation—it significantly enhances iron absorption, especially critical with your severely low iron saturation. 2
• Do not attribute all your symptoms to menorrhagia without screening for celiac disease—it is a common, treatable cause of iron malabsorption in young women. 1, 3

Long-Term Monitoring

• Recheck hemoglobin and ferritin every 3 months for the first year after completing therapy, then again after another year. 2
• If your anemia recurs despite adequate iron stores, this indicates ongoing blood loss requiring further gynecologic or gastrointestinal investigation. 1, 2