Abdominal PainPainChronic PainPain ManagementAbdomen, AcutePain ThresholdPain, PostoperativePain MeasurementBack PainPain, IntractableLow Back PainNeck PainPelvic PainAcute PainPain PerceptionAppendicitisFacial PainIrritable Bowel SyndromePain, ReferredGastrointestinal DiseasesConstipationIleal DiseasesAbdomenTorsion AbnormalityShoulder PainTomography, X-Ray ComputedTreatment OutcomeTissue and Organ ProcurementOrgan TransplantationMusculoskeletal PainColonic Diseases, FunctionalRadiography, AbdominalChronic DiseaseIntestinal ObstructionPancreatitisColitis, IschemicVisceral PainAnalgesicsIntestinal PerforationCecal DiseasesIntussusceptionJejunal DiseasesColonic DiseasesRupture, SpontaneousAcute DiseaseRetrospective StudiesLaparotomyNociceptive PainPancreatitis, ChronicNeuralgiaProspective StudiesMultiple Organ FailureAnalgesics, OpioidFlatulenceDiarrheaAppendectomyAppendixHemoperitoneumEndoscopy, Digestive SystemVomitingMesenteric Vascular OcclusionOrgan SizeColicLaparoscopyFatal OutcomeRecurrenceTime FactorsOrgan of CortiHyperalgesiaCholecystitisDiverticulitisQuestionnairesOrgan SpecificityDefecationSeverity of Illness IndexFollow-Up StudiesDiagnostic ErrorsEndoscopy, GastrointestinalColonoscopyPeritonitis, TuberculousMesenteric LymphadenitisIntestinal DiseasesDouble-Blind MethodDuodenal DiseasesMyofascial Pain SyndromesArthralgiaHymenComplex Regional Pain SyndromesMesenteric Artery, SuperiorHematocolposHeadacheFlank PainPeritoneal DiseasesPurpura, Schoenlein-HenochSplenic DiseasesVisceral AfferentsGastrointestinal AgentsCeliac ArteryEnteritisCholangiopancreatography, Endoscopic Retrograde