If you have landed here, there is a good chance you have already felt something the standard advice does not quite name: the tingling around your lips and fingertips that comes and goes, the muscle cramps that arrive without warning, the twitch under your eye, or a lab report that simply says your calcium is "a little low" with no real explanation of why.

If you are living with chronic inflammatory demyelinating polyneuropathy, you already know that the standard advice tends to stop at a diagnosis and a first-line treatment. Take intravenous immunoglobulin, or steroids, or start plasma exchange, and see how you respond.

If you or someone you care about has been told "mononeuritis multiplex," you've probably noticed that the explanation stops short of what you actually need. The name describes a pattern — several individual nerves, in unrelated parts of the body, failing one after another — but it isn't a diagnosis in itself.