Pain ThresholdPainSensory ThresholdsPain MeasurementPain PerceptionTranscutaneous Electric Nerve StimulationPain ManagementHyperalgesiaChronic PainThermosensingDifferential ThresholdAnalgesicsAuditory ThresholdPain, ReferredPain, PostoperativeNociceptorsEar, ExternalAnalgesiaDental Pulp TestHot TemperatureFibromyalgiaFacial PainPressurePhysical StimulationLow Back PainAcupuncture PointsNeck PainAcupuncture AnalgesiaWristSensationHypesthesiaBack PainMyofascial Pain SyndromesAnalgesics, OpioidToothacheNociceptive PainNeuralgiaAnalgesics, Non-NarcoticAbdominal PainPain, IntractableElectric StimulationElectric Stimulation TherapyHyperesthesiaPelvic PainAcupuncture TherapySomatosensory DisordersVibrationTime FactorsElectroacupunctureSkin TemperatureDouble-Blind MethodAnalysis of VarianceCold Temperaturebeta-EndorphinMorphineIrritable Bowel SyndromeRadial NerveAcute PainTemporomandibular Joint Dysfunction SyndromeLidocaineWhiplash InjuriesAnesthetics, LocalMigraine DisordersTaste ThresholdThreshold Limit ValuesCross-Over StudiesChronic DiseaseSkin Physiological PhenomenaTouchShoulder PainEvoked Potentials, SomatosensoryMusculoskeletal PainAnaerobic ThresholdPerceptionSpinal CordRats, Sprague-DawleySkinNAV1.7 Voltage-Gated Sodium ChannelReproducibility of ResultsBehavior, AnimalSensation DisordersInjections, SpinalPreanesthetic MedicationReaction TimeNAV1.8 Voltage-Gated Sodium ChannelDiabetic NeuropathiesDose-Response Relationship, DrugLasersNerve FibersThoracic WallTreatment OutcomePeriaqueductal GrayAcetaminophenNAV1.9 Voltage-Gated Sodium ChannelPeripheral NervesNaloxoneEndorphinsProspective StudiesQuestionnairesPsychophysics