Originally Posted by mrsD

Pernicious anemia is not the same as Low B12.

Low B12 over long periods of time may result in the "anemia", but many do not. In other words, not everyone has anemia.
Pernicious anemia is an old term that referred to people, mostly genetic and running in families, who had no intrinisic factor in the stomach, either due to autoimmune or genetic failure, or lack of stomach acid.

Pernicious anemia has low red cells as a presenting symptom.
Folate masks that anemia...that is what "mask" means.

I don't think today pernicious anemia is used as much, since low B12 results in neurological symptoms way before the anemia becomes visible.