Over time, old medical terms (such as Alzheimer's dementia) take on a new meaning as research makes new findings. I wonder about Pernicious Anaemia as I can never be sure if a web page or article is using an out of date meaning or not.
Speaking as rigorously as possible ... am I right in thinking that Pernicious Anaemia is nowadays seems as a subtype of Macrocytic Anaemia (characterised by large but inefficient red blood cells) which is due to B12 deficiency and commonly caused by poor gut absorption of B12?
If so then presumably Pernicious Anaemia can also be caused by other problems of B12 absorption or utilisation, such as defective genes? Would this still be called Pernicious Anemia?
What if a patient has poor B12 absorption to the point of general deficiency but does NOT have any significant form of anaemia? Would this nowadays get classified as Pernicious Anaemia?
I ask all the above because I don't seem to have B12 absorption problems and am unsure if I do or do not have anaemia. (At times I get exceedingly breathless on the slightest exertion and this lasts for ages.) I do benefit from B12 injections and can relate to all the non-blood symptoms. I also seem to need to top up my B12 very regularly or I will relapse quite quickly.
Thanks for any explanatory comments.