Pain ThresholdPainPain MeasurementPain, PostoperativeAnalgesics, OpioidAnalgesia, Patient-ControlledAnalgesia, EpiduralPain ManagementPain PerceptionChronic PainSensory ThresholdsTranscutaneous Electric Nerve StimulationMorphineAnesthetics, LocalHyperalgesiaFentanylLow Back PainPain, ReferredBack PainNeck PainFacial PainAnalgesicsThermosensingAbdominal PainPain, IntractableAnalgesiaNociceptorsPelvic PainEar, ExternalFibromyalgiaDental Pulp TestHot TemperatureAcute PainNociceptive PainNeuralgiaPressureMyofascial Pain SyndromesAcupuncture PointsAcupuncture AnalgesiaPhysical StimulationToothacheHypesthesiaShoulder PainWristAnalgesics, Non-NarcoticSensationMusculoskeletal PainDifferential ThresholdElectric Stimulation TherapyAcupuncture TherapyDouble-Blind MethodHyperesthesiaChronic DiseaseAuditory ThresholdTime FactorsElectroacupunctureSomatosensory DisordersAnalysis of VarianceElectric StimulationLidocaineCold TemperatureTemporomandibular Joint Dysfunction SyndromeIrritable Bowel Syndromebeta-EndorphinWhiplash InjuriesSkin TemperatureRadial NerveVibrationMigraine DisordersTreatment OutcomeCross-Over StudiesQuestionnairesSpinal CordInjections, SpinalPerceptionEvoked Potentials, SomatosensorySkin Physiological PhenomenaProspective StudiesTouchRats, Sprague-DawleyComplex Regional Pain SyndromesVisceral PainNAV1.7 Voltage-Gated Sodium ChannelReproducibility of ResultsBehavior, AnimalSensation DisordersPreanesthetic MedicationSeverity of Illness IndexSkinNAV1.8 Voltage-Gated Sodium ChannelArthralgiaAcetaminophenDiabetic NeuropathiesPeriaqueductal GrayThoracic WallLabor PainNaloxoneLasersAnti-Inflammatory Agents, Non-SteroidalNAV1.9 Voltage-Gated Sodium Channel