What causes symptoms in pernicious anemia?

I'm looking for information as to the biochemical reason for pernicious anemia causing symptoms such as sore tongue, difficulty swallowing and stomach pain. I know it's due to a B12 deficiency, but how does that extend to the symptoms I mentioned above? Please cite references if you know of any. I've... show more I'm looking for information as to the biochemical reason for pernicious anemia causing symptoms such as sore tongue, difficulty swallowing and stomach pain. I know it's due to a B12 deficiency, but how does that extend to the symptoms I mentioned above? Please cite references if you know of any. I've been searching online for an hour with no luck. Thank you very much, and 10 points for the best answer.
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