What are the causes of the symptoms of pernicious anemia?

Symptoms Causes the comments: concern of Max Power : What are the causes of the symptoms of pernicious anemia I am looking for data on the biochemical cause of anemia causes symptoms appear like sore tongue, difficulty swallowing and stomach discomfort. I know it is due to vitamin B12 deficiency, but as this covers the symptoms above, I? Please cite references if you know of. I searched on the internet for an hour without having good results. Thank you very a lot, and 10 points for best

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