title: The stress-pain connection: some historical considerations and new directions.
mesh_terms: D000818:Animals; D001007:Anxiety / Q000502:physiology; D002490:Central Nervous System / Q000502:physiology; D004558:Electric Stimulation; D004723:Endorphins / Q000502:physiology; D004745:Enkephalins / Q000502:physiology; D006801:Humans; D008606:Mental Processes / Q000502:physiology; D010146:Pain / Q000503:physiopathology*; D013312:Stress, Physiological / Q000503:physiopathology*; D013315:Stress, Psychological / Q000502:physiology; D004561:Transcutaneous Electric Nerve Stimulation
chemical_list: D004723:Endorphins; D004745:Enkephalins