Chronic PainPainPain MeasurementPain ClinicsAnalgesics, OpioidChronic DiseasePain ManagementOpioid-Related DisordersPain, IntractableCarisoprodolCatastrophizationDrug IncompatibilityFibromyalgiaOxycodoneHydrocodoneSubstance Abuse DetectionAnalgesicsLow Back PainPain ThresholdBack PainUrinalysisFacial PainQuestionnairesSeverity of Illness IndexNeck PainPain, PostoperativeDrug MonitoringNeuralgiaPain PerceptionMusculoskeletal PainAcute PainDisability EvaluationPain, ReferredPelvic PainAbdominal PainHyperalgesiaAdaptation, PsychologicalDepressionChest PainShoulder PainHydromorphoneTemporomandibular Joint DisordersAnalgesiaTreatment OutcomeNociceptorsNociceptive PainComplex Regional Pain SyndromesProspective StudiesArthralgiaMorphineQuality of LifeMyofascial Pain SyndromesActivities of Daily LivingTime FactorsAnxietyReproducibility of ResultsCentral Nervous System SensitizationPsychometricsNociceptionCross-Sectional StudiesSpinal CordInjections, SpinalIntervertebral Disc DisplacementFollow-Up StudiesPrevalenceRetrospective StudiesAnalgesics, Non-NarcoticAnalysis of VarianceDouble-Blind MethodAnesthetics, LocalHernia, InguinalPhysical StimulationPhysical Therapy ModalitiesRisk FactorsPredictive Value of TestsVisceral PainAcute DiseasePosterior Horn CellsDisabled PersonsSpinal NervesAbsenteeismStress, PsychologicalCohort StudiesPeripheral Nervous System DiseasesManipulation, SpinalIllness BehaviorStreet DrugsMusculoskeletal DiseasesHeadachePrimary Health CareHypnosisTranscutaneous Electric Nerve StimulationDisease Models, AnimalRats, Sprague-DawleySingle-Blind MethodMagnetic Resonance ImagingFearWhiplash InjuriesTrigeminal Nerve DiseasesGanglia, Spinal