Acute PainPainPain MeasurementPain ManagementPain, PostoperativeAnalgesics, OpioidPain ClinicsPain ThresholdChronic PainAnalgesicsAnalgesiaPain, IntractablePain PerceptionHyperalgesiaMorphineAnesthesia Department, HospitalFacial PainLow Back PainBack PainAcute DiseaseNeuralgiaAbdominal PainAnalgesics, Non-NarcoticNeck PainAnalgesia, Patient-ControlledNociceptorsPelvic PainUnited States Department of DefenseNarcotic AntagonistsPain, ReferredNaloxoneChronic DiseaseRecovery RoomInjections, SpinalToothacheAcupunctureShoulder PainAnesthetics, LocalAnalgesia, EpiduralBuprenorphineMusculoskeletal PainNarcoticsCyclohexanecarboxylic AcidsOpioid-Related DisordersHot TemperatureKetoprofenAnti-Inflammatory Agents, Non-SteroidalTreatment OutcomeDouble-Blind MethodDiclofenacKetamineKetorolacNociceptive PainAcetaminophenFormaldehydeCryingOxycodoneSpinal CordBehavior, AnimalRats, Sprague-DawleyLidocaineFentanylGanglia, SpinalCapsaicinSkin Physiological PhenomenaTime FactorsOpioid PeptidesReceptors, OpioidTranscutaneous Electric Nerve StimulationPeripheral Nervous System DiseasesAnesthetics, DissociativeAnesthesiologyEnkephalin, MethionineDexmedetomidineQuestionnairesHerpes ZosterNerve BlockAminesPosterior Horn CellsAnemia, Sickle CellCarrageenanDose-Response Relationship, DrugProspective StudiesInfant BehaviorEnkephalin, Ala(2)-MePhe(4)-Gly(5)-Physical StimulationDisease Models, AnimalCold TemperatureInflammationSeverity of Illness IndexHydromorphoneReceptors, Opioid, kappaMyofascial Pain SyndromesEndorphinsEnkephalinsComplex Regional Pain SyndromesAnalysis of VarianceTRPV Cation ChannelsVisceral PainHydrocortisone