Eli5 Why can’t our bodies or outside medicines repair nerve damage?

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I’m a type 1 diabetic that can’t really feel my feet or my legs under my knees. I suppose I can kinda feel them, like I can feel pressure, but I can’t seem to feel if I get a little kitty scratch on my leg.

I do check my feet rather often and such, as a type 1 diabetic should. But this all makes me wonder why we can’t repair the nerves that are damaged with medicines and why our bodies don’t do it themselves, like they repair other parts of our bodies.

In: Biology