I don't understand "nerves growing back". My neurologist said that my nervous system is dying (parts of us die as we get older, with some people it's the heart or liver, kidneys or worse yet: the brain). Science hasn't yet devised a way to resurrect a dying nervous system. Medical researchers used to think that neuropathy was just for diabetics but not any more -- there are too many people with neuropathy who don't have diabetes. It sounds like it doesn't have to have any cause other than "aging". More will be revealed to us as research continues. Peggy