PainPain MeasurementPain ManagementPain, PostoperativeAnalgesics, OpioidChronic PainPain, IntractableBack PainAnalgesicsFacial PainPain ThresholdBrachial Plexus NeuritisMorphineLow Back PainOxycodoneTramadolAnalgesiaAbdominal PainNeuralgiaNeck PainAnesthetics, LocalTreatment OutcomeRelief WorkPelvic PainPain PerceptionChronic DiseaseAcute PainLidocainePain, ReferredHemorrhoidsSeverity of Illness IndexReflex Sympathetic DystrophyDouble-Blind MethodFentanylProspective StudiesPalliative CareAnalgesics, Non-NarcoticNerve BlockShoulder PainHyperalgesiaAnalgesia, Patient-ControlledFollow-Up StudiesAnesthesia, LocalVertebroplastyMusculoskeletal PainDrug ToleranceFractures, CompressionMiddle EastTime FactorsQuestionnairesReceptors, Opioid, muSacrumDisability EvaluationOpioid-Related DisordersRange of Motion, ArticularRetrospective StudiesOsteoarthritis, KneeSpinal FracturesSpinal NeoplasmsHerpes ZosterOsteoarthritisNociceptive PainBone NeoplasmsArthroplasty, Replacement, KneeCross-Sectional StudiesKnee JointAnti-Inflammatory Agents, Non-SteroidalNeoplasmsLabor PainAnemia, Sickle CellQuality of LifePostoperative ComplicationsAcute DiseasePrevalenceInjections, IntravenousComplex Regional Pain SyndromesArthralgiaMyofascial Pain SyndromesVisceral PainPatient SatisfactionAge FactorsTomography, X-Ray ComputedCohort StudiesDose-Response Relationship, DrugTrigeminal NeuralgiaBupivacaineRisk FactorsLongitudinal StudiesNociceptorsRadiculopathyInjections, SpinalInjections, EpiduralAnalgesia, EpiduralLogistic ModelsAnalgesia, ObstetricalInjections, Intra-ArticularZygapophyseal JointFibromyalgiaEye PainTranscutaneous Electric Nerve Stimulation