My daughter , like me is a chronic indigestion surfferer.
As they can destroy the intrinsic factor already mentioned , but only because of the intrinsic factor ,she was told that overuse of indigestion remedies can pre-dispose someone to P.A.
She and I have another auto- immune disease Vitiligo. Our skin, especially in a hot summer and during pregnancy, especially on our faces is very varied in tone .Pale in some places but with a tanned appearance in others. This is nothing to do with sunbathing. All connected in some way I suppose.
In the words of . Mrs. Mopp---- "It`s being so cheerful as keeps me going"
Viktoria.
P.S.I also have an underactive thyroid.Another auto-immune disease.