Neuropathic pain is now defined by the International Association for the Study of Pain (IASP) as ‘pain caused by a lesion or disease of the somatosensory nervous system. This replaces the older definition of ‘pain initiated or caused by a primary lesion, dysfunction or transitory perturbation of the peripheral or central nervous system’. Examples are: trigeminal neuralgia, zoster, diabetic neuropathy, etc. Watch my full video about neuropathic pain.