Abdominal PainIntestine, SmallIntestinesPainIntestine, LargeChronic PainPain ManagementAbdomen, AcutePain ThresholdPain, PostoperativePain MeasurementBack PainPain, IntractableLow Back PainNeck PainPelvic PainAcute PainPain PerceptionAppendicitisFacial PainGastrointestinal DiseasesIntestinal MucosaIrritable Bowel SyndromePain, ReferredIleal DiseasesJejunumConstipationAbdomenShoulder PainTorsion AbnormalityIntestinal ObstructionIleumTomography, X-Ray ComputedMusculoskeletal PainColonic Diseases, FunctionalTreatment OutcomeDuodenumIntestinal AbsorptionIntestinal DiseasesChronic DiseaseRadiography, AbdominalJejunal DiseasesColitis, IschemicIntestinal PerforationPancreatitisIntussusceptionDiarrheaAnalgesicsCecal DiseasesVisceral PainColonIntestinal NeoplasmsColonic DiseasesRupture, SpontaneousLaparotomyEnteritisNociceptive PainAppendixAcute DiseaseNeuralgiaFlatulencePancreatitis, ChronicMesenteric Vascular OcclusionRetrospective StudiesAnalgesics, OpioidAppendectomyEndoscopy, Digestive SystemVomitingProspective StudiesHemoperitoneumColicTime FactorsEndoscopy, GastrointestinalDefecationGastrointestinal MotilityLaparoscopyFatal OutcomeHyperalgesiaDiverticulitisRecurrenceIleal NeoplasmsColonoscopyCholecystitisJejunal NeoplasmsFecesFollow-Up StudiesQuestionnairesDiagnostic ErrorsMesenteric LymphadenitisDuodenal DiseasesCecumMesenteryMesenteric Artery, SuperiorPeritonitis, TuberculousDouble-Blind MethodSeverity of Illness IndexDigestive SystemMyofascial Pain SyndromesArthralgiaGastrointestinal Agents