PainPain ManagementChronic PainPain, PostoperativePain MeasurementPain ThresholdBack PainLow Back PainPain, IntractableAbdominal PainNeck PainRelief WorkPelvic PainPain PerceptionFacial PainAcute PainPain, ReferredShoulder PainAnalgesicsMusculoskeletal PainAnalgesics, OpioidNeuralgiaTreatment OutcomeNociceptive PainAnalgesiaLabor PainChronic DiseaseAnesthetics, LocalComplex Regional Pain SyndromesHyperalgesiaArthralgiaMyofascial Pain SyndromesDouble-Blind MethodNerve BlockVisceral PainMorphineTrigeminal NeuralgiaAnalgesics, Non-NarcoticBupivacainePalliative CareProspective StudiesQuestionnairesNociceptorsRadiculopathyFollow-Up StudiesInjections, SpinalInjections, EpiduralAnalgesia, EpiduralLidocaineTime FactorsAnalgesia, ObstetricalInjections, Intra-ArticularZygapophyseal JointFibromyalgiaDisability EvaluationTramadolAnalgesia, Patient-ControlledEye PainTranscutaneous Electric Nerve StimulationSeverity of Illness IndexAcupuncture AnalgesiaElectric Stimulation TherapyQuality of LifeSciaticaCatastrophizationAnti-Inflammatory Agents, Non-SteroidalRange of Motion, ArticularIntervertebral Disc DisplacementOsteoarthritis, KneeFlank PainAcupuncture TherapyToothacheRetrospective StudiesFentanylLumbosacral RegionOxycodoneOsteoarthritisSpinal NervesParesthesiaPhantom LimbKnee JointCeliac PlexusCausalgiaAnesthesia, LocalPhysical Therapy ModalitiesMeperidineHeadacheNociceptionHydromorphonePeripheral Nervous System DiseasesKetorolacFacial NeuralgiaSpinal CordDysmenorrheaPostoperative ComplicationsCyclohexanecarboxylic AcidsAcetaminophenRecovery of FunctionAcute DiseaseMusculoskeletal Diseases