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TrueBrit
reply to post by Jordan River
Radiation, from what I understand, does not cause numbness. In fact, initial ingestion of radioactive material does not have any IMMEDIATE side effects, so it is unlikely that radioactivity is the cause of the numbness in your mouth. You would probably want to look into heavy metals more than radioactivity, if there is a sensory change happening while you actually eat the stuff, that is, assuming that it is the tuna which is causing the numbness.
You may wish to visit the doctor if you are truely concerned, only, I would advise you not to profer any theories while you are at the doctors office.