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Although brain mGluR5 is localized on cell surface and intracellular membranes, neither the presence nor physiological role of spinal intracellular mGluR5 is established. Here we show that in spinal dorsal horn neurons &gt;80% of mGluR5 is intracellular, of which \u223c60% is located on nuclear membranes, where activation leads to sustained Ca<jats:sup>2+<\/jats:sup>responses. Nerve injury inducing nociceptive hypersensitivity also increases the expression of nuclear mGluR5 and receptor-mediated phosphorylated-ERK1\/2, Arc\/Arg3.1 and c-<jats:italic>fos<\/jats:italic>. Spinal blockade of intracellular mGluR5 reduces neuropathic pain behaviours and signalling molecules, whereas blockade of cell-surface mGluR5 has little effect. Decreasing intracellular glutamate via blocking EAAT-3, mimics the effects of intracellular mGluR5 antagonism. These findings show a direct link between an intracellular GPCR and behavioural expression<jats:italic>in vivo<\/jats:italic>. 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