Acute PainPainPain ManagementPain MeasurementPain, PostoperativeChronic PainPain ThresholdPain ClinicsAnalgesicsPain, IntractableLow Back PainBack PainPain PerceptionAbdominal PainFacial PainNeck PainAnalgesics, OpioidAnalgesiaPelvic PainPain, ReferredHyperalgesiaNeuralgiaAcute DiseaseAnesthesia Department, HospitalShoulder PainMusculoskeletal PainNociceptorsAnalgesics, Non-NarcoticAnalgesia, Patient-ControlledMorphineChronic DiseaseUnited States Department of DefenseToothacheNociceptive PainRecovery RoomAnesthetics, LocalAcupunctureInjections, SpinalTreatment OutcomeCyclohexanecarboxylic AcidsAnti-Inflammatory Agents, Non-SteroidalHot TemperatureMyofascial Pain SyndromesKetoprofenComplex Regional Pain SyndromesVisceral PainAnalgesia, EpiduralDiclofenacQuestionnairesLidocaineDouble-Blind MethodKetorolacFormaldehydeTranscutaneous Electric Nerve StimulationCryingAcetaminophenArthralgiaNarcotic AntagonistsGanglia, SpinalKetamineSpinal CordPeripheral Nervous System DiseasesNerve BlockLabor PainCapsaicinBehavior, AnimalProspective StudiesSkin Physiological PhenomenaBuprenorphineAnesthesiologyTime FactorsPosterior Horn CellsSeverity of Illness IndexHerpes ZosterAminesAnesthetics, DissociativeAnemia, Sickle CellCarrageenanRats, Sprague-DawleyDexmedetomidineCold TemperatureInfant BehaviorFibromyalgiaDisability EvaluationCatastrophizationInflammationFlank PainDisease Models, AnimalNaloxoneTRPV Cation ChannelsEye PainDose-Response Relationship, DrugPhysical StimulationAnalysis of VarianceMagnetic Resonance ImagingEmergency Service, HospitalHydrocortisoneSciaticaHong KongOsteoarthritis, Knee