You're joking, right? Or a complete ignoramus about medicine? Pain is transmitted by the nervous system.
Neurologists begin learning about pain relief as first-year residents. Some neurologists go on to do pain-relief fellowships, and specialize in the field to the exclusion of all else. Along with anesthesiologists, neurologists are the specialists who are consulted about pain relief issues by other physicians.
-ccm
That's me. Thank you for correction.