What does Boxing Day have to do with boxing?
1807, from Greek neuron "nerve" (see neuro-) + -algia. Probably formed on model of French névralgie (1801). Related: Neuralgic.
neuralgia neu·ral·gia (nu-rāl'jə, nyu-)n. Sharp, severe paroxysmal pain extending along a nerve or group of nerves. Also called neurodynia.