What is the primary cause of iron deficiency anemia in adults?

A Inadequate dietary intake
B Chronic blood loss ✓
C Increased iron requirements
D Impaired iron absorption

Explanation

Chronic blood loss is the primary cause of iron deficiency anemia in adults, as it leads to a gradual depletion of iron stores.

Source

Harrison's Principles of Internal Medicine
Hematology Hematology: Anemia Hematology: Anemia Easy MEDICAL Confidence: high