Pain ThresholdPainPain MeasurementSensory ThresholdsPain PerceptionTranscutaneous Electric Nerve StimulationPain ManagementHyperalgesiaChronic PainThermosensingPain, ReferredPain, PostoperativeAnalgesicsEar, ExternalAnalgesiaDental Pulp TestNociceptorsFibromyalgiaFacial PainHot TemperatureLow Back PainPressurePhysical StimulationAcupuncture PointsNeck PainAcupuncture AnalgesiaWristBack PainHypesthesiaMyofascial Pain SyndromesToothacheAnalgesics, OpioidSensationNociceptive PainNeuralgiaAbdominal PainDifferential ThresholdAnalgesics, Non-NarcoticAuditory ThresholdGene FrequencyPain, IntractableElectric StimulationElectric Stimulation TherapyPelvic PainVibrationAcupuncture TherapyTime FactorsHyperesthesiaElectroacupunctureDouble-Blind MethodAnalysis of VarianceSomatosensory Disordersbeta-EndorphinIrritable Bowel SyndromeCold TemperatureAcute PainRadial NerveMorphineSkin TemperatureTemporomandibular Joint Dysfunction SyndromeMigraine DisordersLidocaineWhiplash InjuriesAnesthetics, LocalChronic DiseaseCross-Over StudiesShoulder PainSkin Physiological PhenomenaMusculoskeletal PainEvoked Potentials, SomatosensoryTouchPerceptionRats, Sprague-DawleySpinal CordSkinNAV1.7 Voltage-Gated Sodium ChannelPreanesthetic MedicationQuestionnairesBehavior, AnimalReproducibility of ResultsSensation DisordersTreatment OutcomeNAV1.8 Voltage-Gated Sodium ChannelInjections, SpinalReaction TimeProspective StudiesLasersThoracic WallPeriaqueductal GrayAcetaminophenEndorphinsNAV1.9 Voltage-Gated Sodium ChannelDiabetic NeuropathiesDose-Response Relationship, DrugNaloxoneNerve FibersRandom AllocationPeripheral NervesSeverity of Illness IndexCase-Control Studies