Since diabetes is a leading cause of neuropathy and you don't your cause just yet, I think it is a good precaution while you search for the cause. My routine lab work shows I do not have diabetes but that is based on glucose level standards. "One size fits all" thinking. Perhaps I have a glucose tolerance issue that does not respond to the blood test and requires a different test to reveal itself. I don't know but I have an appointment with an endocrinologist to pursue this. Another common cause can be thyroid disease. I don't know my cause but I'm looking into the most common ones first. Just my way of thinking. Can't hurt!