**Question:** Ramla, a 65-year-old male presents with low back pain especially at L3, anemia, and fatiguability. His investigation profile reveals: Hb = 7 g/dL, TLC-9000/cmm, DLC -N- 55%, L-30%, M-10%, E-1%, -2%, serum proteins-8 g/dL, ratio-2.9/5.9, ESR-90, and serum creatinine-3.2 mg%. Likely diagnosis is -

A. Anemia of chronic disease (ACD)
B. Malignancy
C. Hemolytic anemia
D. Renal failure

**Correct Answer:**

**Core Concept:** Anemia of chronic disease (ACD) is a type of anemia that occurs secondary to chronic inflammatory conditions, such as rheumatoid arthritis, inflammatory bowel disease, or malignancy. In ACD, the red blood cell precursors in the bone marrow are suppressed, leading to reduced production of red blood cells (RBCs).

**Why the Correct Answer is Right:**

In this case, the patient presents with low back pain, fatigue, and anemia. His laboratory findings show a low hemoglobin level (7 g/dL), raised total leukocyte count (9000/cmm), and elevated ESR (90 mm/hr). Additionally, his serum creatinine is elevated (3.2 mg/dL), suggesting chronic kidney disease. These findings are consistent with anemia of chronic disease (ACD).

**Why Other Options Are Incorrect:**

A) Malignancy (Option B) is not the correct answer because the patient's anemia is not due to hemolysis or iron deficiency.

B) Hemolytic anemia (Option C) is not supported by the patient's normal reticulocyte count and normal hemoglobin electrophoresis.

D) Renal failure (Option D) seems plausible due to elevated serum creatinine, but anemia is not solely explained by renal insufficiency in this case.

**Clinical Pearl:** Anemia of chronic disease should be considered in the differential diagnosis of anemia in patients with chronic illnesses like rheumatoid arthritis, inflammatory bowel disease, or malignancy, along with elevated ESR and renal dysfunction. In such cases, the treatment usually includes addressing the underlying disease, as ACD is a secondary anemia that improves when the primary cause is treated.