title: Neurophysiological pain theories.
mesh_terms: D004723:Endorphins / Q000502:physiology; D006801:Humans; D009482:Neurophysiology; D009619:Nociceptors / Q000503:physiopathology; D010146:Pain / Q000503:physiopathology* / Q000523:psychology
chemical_list: D004723:Endorphins