Pain ThresholdSensationPainPain MeasurementSensory ThresholdsPain PerceptionThermosensingTranscutaneous Electric Nerve StimulationPain ManagementHyperalgesiaChronic PainNociceptorsHypesthesiaPain, ReferredPain, PostoperativeAnalgesicsPhysical StimulationDental Pulp TestEar, ExternalSensation DisordersAnalgesiaHot TemperatureFacial PainPressureSomatosensory DisordersFibromyalgiaAcupuncture PointsLow Back PainNeck PainWristAcupuncture AnalgesiaBack PainAnalgesics, OpioidNociceptive PainMyofascial Pain SyndromesNeuralgiaTouchToothacheAbdominal PainSkin TemperatureAnalgesics, Non-NarcoticDifferential ThresholdCold TemperaturePain, IntractableElectric Stimulation TherapyAcupuncture TherapyVibrationElectric StimulationAuditory ThresholdHyperesthesiaDouble-Blind MethodIrritable Bowel SyndromePelvic PainElectroacupunctureRadial NerveAnalysis of VariancePerceptionSkin Physiological PhenomenaTime FactorsAnesthetics, Localbeta-EndorphinMorphineAcute PainLidocaineTemporomandibular Joint Dysfunction SyndromeCross-Over StudiesWhiplash InjuriesEvoked Potentials, SomatosensoryMigraine DisordersChronic DiseaseSkinShoulder PainMusculoskeletal PainSpinal CordNAV1.7 Voltage-Gated Sodium ChannelDiabetic NeuropathiesNerve FibersHandBehavior, AnimalRats, Sprague-DawleyPreanesthetic MedicationQuestionnairesPeripheral NervesInjections, SpinalPruritusMucunaParesthesiaTaste ThresholdNAV1.8 Voltage-Gated Sodium ChannelTreatment OutcomeLasersPhantom LimbThoracic WallReproducibility of ResultsAnxietyProspective StudiesNAV1.9 Voltage-Gated Sodium ChannelPeriaqueductal GrayAcetaminophenEndorphins