PainChronic PainPain ManagementPain ThresholdPain, PostoperativeBack PainLow Back PainPain MeasurementAbdominal PainNeck PainPain, IntractablePelvic PainPain PerceptionFacial PainAcute PainPain, ReferredShoulder PainMusculoskeletal PainAnalgesicsNociceptive PainNeuralgiaTreatment OutcomeAnalgesics, OpioidChronic DiseaseMyofascial Pain SyndromesHyperalgesiaComplex Regional Pain SyndromesVisceral PainQuestionnairesProspective StudiesArthralgiaQuality of LifeSeverity of Illness IndexFollow-Up StudiesAnalgesiaLabor PainPrognosisTime FactorsRetrospective StudiesDisability EvaluationNociceptorsFibromyalgiaAnesthetics, LocalCatastrophizationFlank PainDouble-Blind MethodRisk FactorsEye PainCross-Sectional StudiesCohort StudiesMorphineOsteoarthritis, KneeAnalgesics, Non-NarcoticAnalysis of VarianceActivities of Daily LivingInjections, SpinalKnee JointSciaticaToothacheLidocaineNerve BlockPrevalenceHealth StatusRange of Motion, ArticularAge FactorsPredictive Value of TestsMagnetic Resonance ImagingPhysical Therapy ModalitiesMusculoskeletal DiseasesNociceptionAcute DiseaseSpinal NervesPhantom LimbDepressionSex FactorsSurvival AnalysisPeripheral Nervous System DiseasesRecovery of FunctionTrigeminal NeuralgiaTemporomandibular Joint DisordersMultivariate AnalysisRadiculopathyIntervertebral Disc DisplacementComorbiditySurvival RateReproducibility of ResultsSpinal CordAdaptation, PsychologicalAnxietyOutcome Assessment (Health Care)Transcutaneous Electric Nerve StimulationAcupuncture AnalgesiaAnti-Inflammatory Agents, Non-SteroidalHeadacheTramadolOsteoarthritisPalliative CareLumbosacral RegionStatistics, NonparametricOxycodone