Amongst the multiple causes of tingling and numbness of the extremities (hands and/or feet), there are: vitamin deficieencies (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, which can produce the symptoms that you described above.
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