Pain asymbolia, also called pain dissociation, is a condition in which pain is perceived, but does not cause suffering. This usually results from injury to the brain, lobotomy, cingulotomy or morphine analgesia. Preexisting lesions of the insula may abolish the aversive quality of painful stimuli while preserving the location and intensity aspects. Typically, patients report that they have pain but are not bothered by it, they recognize the sensation of pain but are mostly or completely immune to suffering from it.[1][2]
Insofar as it shows that pain may be experienced as a sensation devoid of any unpleasantness, pain asymbolia poses a direct challenge to the classical definition of pain proposed by the International Association for the Study of Pain.[3]
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