Amongst the multiple causes of tingling and numbness of the extremities (hands and feet), there are: vitamin deficienciies (Vitamin B12), nerve compressions at the level of the spine, problems with the peripheral nerves of hands and feet, and metabolic causes as problems with the Thyroid gland and Diabetes. Once that your physician ruled out the vitamin deficiency, and thyroid problems, might be important to rule out some other metabolic causes as Diabetes, of which you have medical history and it can produce the symptom that you described above. Make sure that your diabetes is well controlled and you diet is the adequate.
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