In a hospital-based study of 500 anemic patients in India, the distribution of causes was documented. Which of the following is the most common cause of anemia in hospitalized patients in developing countries?

Explanation

## Most Common Cause of Anemia in Hospitalized Patients **Key Point:** Even in hospitalized populations, iron deficiency anemia remains the most common cause of anemia, though the relative frequency of other causes increases compared to the general population. ### Distribution of Anemias in Hospital Settings | Cause | Frequency in Hospital | Frequency in Community | |-------|----------------------|------------------------| | **Iron deficiency anemia** | 40–50% | 50–60% | | **Anemia of chronic disease** | 20–30% | 5–10% | | **Hemolytic anemia** | 5–10% | 2–3% | | **Aplastic anemia** | 2–5% | <1% | | **Megaloblastic anemia** | 10–15% | 5–10% | **High-Yield:** While anemia of chronic disease becomes relatively more common in hospitalized patients (due to underlying infections, malignancies, and chronic kidney disease), IDA still remains the single most common cause. ### Why IDA Remains Most Common Even in Hospital 1. **Acute bleeding:** GI hemorrhage, trauma 2. **Chronic blood loss:** Malignancy, peptic ulcer disease 3. **Malabsorption:** Celiac disease, post-surgical states 4. **Nutritional deficiency:** Persistent in hospitalized populations **Clinical Pearl:** The shift toward higher prevalence of anemia of chronic disease in hospitals reflects the underlying chronic illnesses (malignancy, infection, renal disease) that necessitate hospitalization, but IDA is still the leading single cause. ### Diagnostic Approach in Hospital Anemia - **Microcytic hypochromic:** Think IDA first - **Normocytic:** Consider anemia of chronic disease, hemolysis, acute bleeding - **Macrocytic:** Megaloblastic or non-megaloblastic causes