D&D Demotivators Episode V: The Demotivator Strikes Back

[Admiral Harkov]

Yeah, it causes the effected pain receptors to start transmitting "I am feeling pain" to your brain. Short of medically-induced coma there isn't anything that can help.

Except that morphine blocks the brain reception of pain, so it should block that if it was like that. Morphine is the strongest painkiller there is because of that. It acts against all pain.

If morphine doesn't block it, it's because it doesn't go through the usual channels of pain. It's something else.

Or a competitor for the brain receptors that activates them and has higher affinity than morphine. This is what surely it is.