Abdominal PainPainChronic PainPain ManagementAbdomen, AcutePain ThresholdPain, PostoperativePain MeasurementBack PainPain, IntractableLow Back PainNeck PainPelvic PainAcute PainPain PerceptionAppendicitisNasal CavityFacial PainPeritoneal CavityIrritable Bowel SyndromePain, ReferredGastrointestinal DiseasesConstipationIleal DiseasesAbdomenTomography, X-Ray ComputedShoulder PainTorsion AbnormalityTreatment OutcomeMusculoskeletal PainColonic Diseases, FunctionalIntestinal ObstructionChronic DiseaseRadiography, AbdominalColitis, IschemicPancreatitisIntestinal PerforationAnalgesicsVisceral PainRupture, SpontaneousCecal DiseasesDental Cavity PreparationIntussusceptionJejunal DiseasesColonic DiseasesLaparotomyPleural CavityRetrospective StudiesNociceptive PainNeuralgiaPancreatitis, ChronicAcute DiseaseHemoperitoneumProspective StudiesAnalgesics, OpioidMouthAppendectomyFlatulenceDiarrheaLaparoscopyEndoscopy, Digestive SystemAppendixVomitingMesenteric Vascular OcclusionFatal OutcomeColicFollow-Up StudiesRecurrenceHyperalgesiaDiverticulitisCholecystitisDiagnostic ErrorsQuestionnairesDefecationTime FactorsEndoscopy, GastrointestinalColonoscopyPeritoneal DiseasesPeritonitis, TuberculousMesenteric LymphadenitisDouble-Blind MethodSeverity of Illness IndexIntestinal DiseasesDuodenal DiseasesMyofascial Pain SyndromesArthralgiaHymenComplex Regional Pain SyndromesHematocolposHeadacheMesenteric Artery, SuperiorPeritonitisFlank PainPurpura, Schoenlein-HenochAbdominal AbscessVisceral AfferentsSplenic DiseasesGastrointestinal AgentsHerniaCysts