Does anemia due to iron deficiency happen quickly or does it take a long time?
Iron deficiency anemia comes on gradually. When your rate of iron loss exceeds the amount of iron you absorb from the gut, iron stores are slowly used up. At this stage, ferritin will be low, but serum iron and TIBC are usually normal and there is no anemia. As iron deficiency worsens, serum iron levels fall, TIBC and transferrin rise, and anemia starts to develop. With prolonged or severe iron deficiency, the red cells become small and pale.
