A 28-year-old woman from rural India presents with fatigue, dyspnea on exertion, and pallor. Laboratory investigations reveal hemoglobin 7.2 g/dL, MCV 62 fL, and serum ferritin 12 ng/mL. What is the most common cause of iron deficiency anemia in women of reproductive age in India?

Explanation

## Most Common Cause of Iron Deficiency Anemia in Reproductive Women in India ### Epidemiology in India **Key Point:** Nutritional deficiency due to inadequate dietary iron intake is the single most common cause of iron deficiency anemia (IDA) in women of reproductive age in India, as consistently documented by national surveys (NFHS-5, ICMR guidelines) and standard PSM textbooks (Park's Textbook of Preventive and Social Medicine). ### Why Nutritional Deficiency Dominates in India **High-Yield:** India bears the highest burden of nutritional anemia globally. According to NFHS-5 (2019–21), approximately 57% of women aged 15–49 years in India are anemic. The primary driver in this population — especially in rural India — is chronic inadequate dietary iron intake, compounded by: 1. **Low bioavailability of dietary iron** — predominantly non-heme iron from plant-based diets (cereals, pulses) with poor absorption (~3–8%) 2. **Inhibitors of iron absorption** — phytates, tannins (tea/coffee), and oxalates prevalent in Indian diets 3. **Increased physiological demands** — menstruation, repeated pregnancies, and lactation further deplete already marginal iron stores 4. **Low socioeconomic status** — limited access to iron-rich foods (meat, fish, poultry) in rural populations ### Pathophysiology of Nutritional IDA - Inadequate dietary iron → negative iron balance → depletion of iron stores (↓ ferritin) → iron-deficient erythropoiesis → microcytic hypochromic anemia - Serum ferritin <12 ng/mL confirms depleted stores (WHO criterion) - MCV <80 fL confirms microcytosis ### Why Other Options Are Less Common as the PRIMARY Cause | Option | Assessment | |--------|-----------| | **A) Nutritional deficiency** | ✅ MOST COMMON — endemic in rural India | | **B) Menorrhagia** | Common contributor but not the primary cause at population level; affects a subset of women | | **C) Celiac disease malabsorption** | Relatively uncommon in this demographic | | **D) Hereditary spherocytosis** | Causes hemolytic anemia, NOT iron deficiency anemia | **Clinical Pearl:** While menorrhagia is an important cause of IDA in individual clinical practice (especially in high-income settings), at the population level in rural India, nutritional deficiency is the predominant etiology. Park's PSM (25th edition) explicitly states: *"The most common cause of nutritional anemia in India is deficiency of iron due to inadequate dietary intake."* Menorrhagia acts as an aggravating factor superimposed on pre-existing nutritional iron deficiency. ### Laboratory Correlation The case presents with: - Low hemoglobin (7.2 g/dL) — moderate anemia - Low MCV (62 fL) — microcytic pattern consistent with IDA - Low ferritin (12 ng/mL) — depleted iron stores This pattern is consistent with nutritional iron deficiency anemia, the most common cause in this demographic and geographic context. **High-Yield for NEET PG/PSM:** In community medicine/PSM questions about India, nutritional deficiency is the correct answer for "most common cause of IDA" in women of reproductive age. Menorrhagia is the answer in clinical gynecology contexts in developed countries.