In diabetes mellitus nephropathy and neuropathy occurs. These are late complications and seen in those patients whose blood glucose levels are not in control. Peripheral neuropathy is nerve damage caused by chronically high blood sugar and diabetes. It leads to numbness, loss of sensation, and sometimes pain in your feet, legs, or hands. It is the most common complication of diabetes.nIn surgery posting. I have seen many patients who had diabetic foot. In all cases they didn’t know how they got a prick in their heel while working on fields (most of them were farmers) since they had loss of sensation. If it is on hand people can at least see that they have got a prick or some sort of injury inspite of loss of sensation. Due to this reason I think that diabetic foot are more common in lower limb.

Reference :