Diabetes can affect the nerves after many years. Typically this involves the longest nerves first, i.e the ones in your legs. When there is nerve involvement, then it tends to be symmetrical. In your case there is only one toe involved, and in a women this may be related to the shoes they wear, in that there may be pressure over the small nerve to the big toe, causing the numbess. I suggest looking at your shoes to see if they are causing pressure points over that particular toe. You may also need to see a podiatrist to assess your feet and shoes.
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