What is pernicious anemia?

Pernicious anemia. It's a condition which results in low vitamin B12 leading to anemia. The person affected with this condition needs the B12 supplement by injection route as oral absorption is impaired.
An autoimmune . Disorder where your body makes antibodies so you can not absorb vitamin B12 so it has to be given by a shot to bypass the stomach and go directly into the bloodstream .