the.com/neuralgia

means A sharp, often stabbing pain that runs along the path of a nerve, with no underlying tissue damage causing it.

from Built from Greek neuron ('nerve, sinew') plus -algia ('pain'), a suffix also found in nostalgia and myalgia. It's an 18th-century medical coinage, part of a wave of Greek-built terms doctors made to name pain by location rather than by cause — which is fitting, since neuralgia is exactly that: pain whose address is known even when its reason isn't.