Pain MeasurementPainSensationPain ThresholdPain PerceptionChronic PainPain ManagementHypesthesiaNociceptorsPain, PostoperativeLow Back PainLateral Thalamic NucleiBack PainThermosensingAbdominal PainNeck PainPain, IntractableHyperalgesiaPelvic PainFacial PainNeuralgiaPain Insensitivity, CongenitalPain, ReferredAcute PainPhysical StimulationTRPV Cation ChannelsNociceptionHot TemperatureSpinothalamic TractsShoulder PainMusculoskeletal PainVentral Thalamic NucleiNAV1.7 Voltage-Gated Sodium ChannelCapsaicinGanglia, SpinalCold TemperatureSkin TemperatureReceptors, Purinergic P2X3Sensation DisordersSensory ThresholdsAnalgesicsSensory Receptor CellsNeurons, AfferentNociceptive PainPressureNerve FibersAnalgesics, OpioidSpinal CordChronic DiseaseReproducibility of ResultsTime FactorsRats, Sprague-DawleyVisceral PainSomatosensory DisordersTreatment OutcomeComplex Regional Pain SyndromesMyofascial Pain SyndromesBehavior, AnimalTouchAnalgesiaQuestionnairesProspective StudiesArthralgiaSodium ChannelsLabor PainPhantom LimbAnesthetics, LocalMagnetic Resonance ImagingDouble-Blind MethodSeverity of Illness IndexDisability EvaluationParesthesia