Hi Crisis, I don’t think idiopathic means no cause rather the dr.’s could not find a cause after ruling out everything they thought could be the initial cause. I’m also not convinced that knowing what the cause was is a guaranteed method to curing it. I would think that with diabetes or vitamin deficiency those causes could be addressed and perhaps improved upon but the rest of us are left to deal with pain control until a drug is developed which can heal or reverse our nerve damage. Just my 2 cents for what that’s worth.