AspirinAnalgesicsPainAnalgesics, OpioidAnalgesics, Non-NarcoticPain MeasurementPain, PostoperativePain ManagementChronic PainPain ThresholdAnti-Inflammatory Agents, Non-SteroidalAnalgesiaPain, IntractableLow Back PainBack PainPlatelet Aggregation InhibitorsAbdominal PainMorphineNeck PainPain PerceptionAcute PainTramadolFacial PainPelvic PainAcetaminophenPhenacetinPain, ReferredDouble-Blind MethodHyperalgesiaNeuralgiaShoulder PainCyclooxygenase InhibitorsNociceptive PainMusculoskeletal PainAnesthetics, LocalDextropropoxypheneIbuprofenDrug ToleranceDose-Response Relationship, DrugCodeineTiclopidineSalicylatesThromboxane B2Treatment OutcomeInjections, SpinalFentanylOxycodoneDrug Therapy, CombinationPlatelet AggregationMeperidineBupivacaineProspective StudiesNociceptorsChronic DiseaseTime FactorsAnalgesia, EpiduralPlatelet Function TestsAnalgesia, Patient-ControlledPentazocineDipyroneNociceptionKetoprofenKidney Papillary NecrosisCarrageenanReceptors, Opioid, muNaloxoneKetorolacTolmetinDiclofenacAcupuncture AnalgesiaVisceral PainCyclohexanecarboxylic AcidsCyclooxygenase 2 InhibitorsSodium SalicylateHydromorphoneLabor PainNarcotic AntagonistsHydrocodoneNerve BlockReceptors, OpioidBlood PlateletsLidocaineEdemaCyclooxygenase 1Rats, Sprague-DawleyNefopamBuprenorphineFibrinolytic AgentsFollow-Up StudiesAnti-Inflammatory AgentsRisk FactorsArthralgiaQuestionnairesDrug InteractionsMyofascial Pain SyndromesProstaglandin-Endoperoxide SynthasesDrug Administration ScheduleAnalgesia, ObstetricalHemorrhageComplex Regional Pain Syndromes