Tag: Achlorhydria

Recent studies indicate that nearly half of all pernicious anemia patients may develop a coexisting iron deficiency either at diagnosis or within the first year. Understanding how does pernicious anemia affect iron reveals a crucial link between the autoimmune condition and impaired mineral absorption, primarily due to low stomach acid.

While the question asks what vitamin deficiency causes achlorhydria, it is often the reverse: the underlying condition causing achlorhydria leads to a vitamin deficiency. An estimated 15–25% of vitamin B12 deficiency in older adults is related to autoimmune atrophic gastritis, which also causes achlorhydria.