PainChronic PainPain ManagementPain ThresholdPain, PostoperativeLow Back PainBack PainPain MeasurementAbdominal PainPain, IntractableNeck PainPelvic PainPain PerceptionFacial PainAcute PainPain, ReferredShoulder PainMusculoskeletal PainAnalgesicsNociceptive PainNeuralgiaAnalgesics, OpioidTreatment OutcomeChronic DiseaseDouble-Blind MethodTime FactorsMyofascial Pain SyndromesHyperalgesiaComplex Regional Pain SyndromesVisceral PainRadiation DosageLethal Dose 50AnalgesiaArthralgiaDrug Administration ScheduleAdministration, OralLabor PainProspective StudiesNociceptorsAnesthetics, LocalRadiometryMorphineQuestionnairesAnalgesics, Non-NarcoticRats, Sprague-DawleyFibromyalgiaDisability EvaluationCatastrophizationInjections, SpinalFollow-Up StudiesDose-Response Relationship, RadiationInjections, IntravenousFlank PainDose FractionationSeverity of Illness IndexRadiotherapy DosageEye PainLidocaineInfusions, IntravenousNeoplasmsArea Under CurveRetrospective StudiesDisease Models, AnimalAnalysis of VarianceAnti-Inflammatory Agents, Non-SteroidalNerve BlockQuality of LifeSciaticaToothacheNociceptionOsteoarthritis, KneeDrug Therapy, CombinationInjections, IntramuscularPeripheral Nervous System DiseasesBupivacaineSpinal CordFentanylHalf-LifeTramadolRadiotherapy Planning, Computer-AssistedSpinal NervesCyclohexanecarboxylic AcidsBehavior, AnimalOxycodonePhysical Therapy ModalitiesMusculoskeletal DiseasesPhantom LimbTrigeminal NeuralgiaKnee JointTomography, X-Ray ComputedAcute DiseaseTemporomandibular Joint DisordersHot TemperatureRadiculopathyRange of Motion, ArticularInjections, SubcutaneousDrug InteractionsSingle-Blind MethodMagnetic Resonance ImagingReproducibility of Results