Vitamin B-12 deficiency anemia can also occur if your small intestine can't absorb vitamin B-12.

CNN: Vitamin deficiency anemia

Vitamin B-12 deficiency anemia caused by a lack of intrinsic factor is called pernicious anemia.

CNN: Vitamin deficiency anemia

Vitamin B-12 deficiency anemia (pernicious anemia).

CNN: Vitamin deficiency anemia

Her exam revealed inordinately high levels of gastrin--an indicator of atrophic gastritis or pernicious anemia, a deficiency of vitamin B12.

FORBES: An Uneasy Mark