There are other possibilities, of course. Including bleeding.

But three things that often occur together, or one after another, are B12 malabsorption, iron malabsorption, and (sometimes as a result of the damage due to B12 deficiency) hypothyroid.

And B12 malabsorption and deficiency are very much underdiagnosed. Please read my website (won't take long) and most doctors are decades behind and don't know even a substantial percentage of these basics.

rose