When you have neuropathic pain or if you have pain after amputation of your leg phantom limb pain often we talk about how the nervous system is overactive so simple things like touching or rubbing your skin can cause severe pain the medical term for that being allodynia or hyperalgesia if it is pain allodynia if it is just pain when you should not experience it and sometimes standard medication the anti-neuropathic medication does not quite help you get on top of these as much as you ordinarily would like and so in these cases it may be appropriate to have an infusion of a drug such as Ketamine.

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