Which of the following is the most common cause of iron deficiency anemia worldwide?

Question

Accepted Answer

B. Nutritional iron deficiency. ## Etiology of Iron Deficiency Anemia

**Key Point:** While chronic GI blood loss is the most common cause in developed countries, nutritional iron deficiency (inadequate dietary intake) remains the leading cause globally, particularly in developing nations and resource-limited settings.

### Geographic and Demographic Variation

| Cause | Prevalence | Geography |
|-------|-----------|----------|
| Nutritional deficiency | Most common worldwide | Developing countries, low SES |
| Chronic GI blood loss | Most common in developed nations | USA, Europe, Australia |
| Menorrhagia | Common in reproductive-age women | All regions |
| Malabsorption | Less common | Post-surgical, celiac disease |

**High-Yield:** In NEET PG exams, when asked about the "most common cause worldwide," the answer is nutritional deficiency. When asked about "most common cause in India" or "in a hospital setting," GI blood loss becomes more relevant.

**Clinical Pearl:** The distinction matters: nutritional IDA typically affects children and women in developing countries; GI blood loss IDA affects older adults in developed countries.

### Why Other Options Are Wrong

- **Hemolysis:** Causes anemia but does NOT deplete iron stores; RBC life span is shortened, not iron absorption impaired.
- **Bone marrow failure:** Results in pancytopenia or selective erythroid hypoplasia, not iron deficiency.

Answer

A. Chronic gastrointestinal blood loss

Answer

C. Hemolysis

Answer

D. Bone marrow failure

Which of the following is the most common cause of iron deficiency anemia worldwide?

Explanation

Etiology of Iron Deficiency Anemia

Geographic and Demographic Variation

Why Other Options Are Wrong

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Cause	Prevalence	Geography
Nutritional deficiency	Most common worldwide	Developing countries, low SES
Chronic GI blood loss	Most common in developed nations	USA, Europe, Australia
Menorrhagia	Common in reproductive-age women	All regions
Malabsorption	Less common	Post-surgical, celiac disease