The causes of tingling and numbness of the extremities , are multiple, we can mention: vitamin deficiencies (Vitamin B B12), nerve compressions at the level of the spine, problems with the peripheral nerves, circulatory problems and metabolic causes as problems with the Thyroid gland and Diabetes. Once that your physician ruled out the nerve compression at the lumbar spine, vitamin deficiency, and peripheral nerves problems, might be important to rule out some other metabolic causes as Diabetes, thyroid problems and circulatory problems also, which can produce the symptoms that you described above.
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