What is the pathophysiology of pernicious anemia?

Updated: Feb 18, 2019
  • Author: Srikanth Nagalla, MD, MS, FACP; Chief Editor: Emmanuel C Besa, MD  more...
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Classic pernicious anemia is caused by the failure of gastric parietal cells to produce sufficient IF (a gastric protein secreted by parietal cells) to permit the absorption of adequate quantities of dietary vitamin B-12. Other disorders that interfere with the absorption and metabolism of vitamin B12 can produce cobalamin deficiency, with the development of a macrocytic anemia and neurologic complications.

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