Pain ThresholdChronic PainPainPain MeasurementPain ManagementPain PerceptionSensory ThresholdsHyperalgesiaTranscutaneous Electric Nerve StimulationPain, PostoperativePain, IntractableAnalgesicsLow Back PainBack PainNeck PainChronic DiseaseFacial PainPain, ReferredAnalgesics, OpioidNeuralgiaAnalgesiaFibromyalgiaNociceptorsAcute PainAbdominal PainThermosensingPelvic PainNociceptive PainEar, ExternalHot TemperatureDental Pulp TestMyofascial Pain SyndromesMusculoskeletal PainPhysical StimulationPressureAcupuncture AnalgesiaShoulder PainAnalgesics, Non-NarcoticHypesthesiaToothacheAcupuncture PointsSensationPain ClinicsWristElectric Stimulation TherapyAcupuncture TherapyMorphineHyperesthesiaAnesthetics, LocalDouble-Blind MethodWhiplash InjuriesQuestionnairesDifferential ThresholdAnalysis of VarianceTime FactorsLidocaineSpinal Cordbeta-EndorphinInjections, SpinalCold TemperatureElectric StimulationComplex Regional Pain SyndromesAuditory ThresholdElectroacupunctureSomatosensory DisordersTreatment OutcomeTemporomandibular Joint Dysfunction SyndromeIrritable Bowel SyndromeArthralgiaRats, Sprague-DawleyRadial NerveSkin TemperatureCross-Over StudiesOpioid-Related DisordersMigraine DisordersVibrationTouchSeverity of Illness IndexBehavior, AnimalPerceptionAnxietyNAV1.8 Voltage-Gated Sodium ChannelVisceral PainProspective StudiesDisability EvaluationNaloxoneReproducibility of ResultsEvoked Potentials, SomatosensoryNociceptionDiabetic NeuropathiesSkin Physiological PhenomenaOxycodonePeriaqueductal GraySensation DisordersDisease Models, AnimalAnti-Inflammatory Agents, Non-SteroidalDrug ToleranceNAV1.7 Voltage-Gated Sodium ChannelAcetaminophenSkin