Tingling, numbness, and pain in the feet often signal peripheral neuropathy, which can be caused by a vitamin B12 deficiency. Severe vitamin B12 deficiency is called pernicious anemia because it can cause a serious fall in the red blood cell count as well as nerve damage. Pernicious anemia results from an autoimmune process that prevents the body from absorbing the vitamin. Having type 1 diabetes, usually an autoimmune problem itself, increases your risk of developing pernicious anemia.
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