Abdominal PainPainChronic PainPain ManagementAbdomen, AcutePain ThresholdPain, PostoperativePain MeasurementBack PainPain, IntractableLow Back PainNeck PainPelvic PainAcute PainPain PerceptionAppendicitisFacial PainIrritable Bowel SyndromePain, ReferredGastrointestinal DiseasesConstipationIleal DiseasesTorsion AbnormalityShoulder PainTomography, X-Ray ComputedAbdomenTreatment OutcomeMusculoskeletal PainColonic Diseases, FunctionalChronic DiseaseIntestinal ObstructionRadiography, AbdominalColitis, IschemicPancreatitisIntestinal PerforationAnalgesicsVisceral PainCecal DiseasesIntussusceptionJejunal DiseasesRupture, SpontaneousColonic DiseasesAcute DiseaseProspective StudiesLaparotomyNeuralgiaNociceptive PainPancreatitis, ChronicAnalgesics, OpioidDiarrheaAppendectomyFlatulenceVomitingHemoperitoneumAppendixEndoscopy, Digestive SystemRetrospective StudiesColicFollow-Up StudiesMesenteric Vascular OcclusionRecurrenceHyperalgesiaFatal OutcomeLaparoscopyDiverticulitisCholecystitisQuestionnairesDiagnostic ErrorsSeverity of Illness IndexDefecationEndoscopy, GastrointestinalColonoscopyDouble-Blind MethodPeritonitis, TuberculousMesenteric LymphadenitisArthralgiaDuodenal DiseasesTime FactorsIntestinal DiseasesMyofascial Pain SyndromesHymenComplex Regional Pain SyndromesHeadacheHematocolposMesenteric Artery, SuperiorFlank PainPeritoneal DiseasesPurpura, Schoenlein-HenochPhysical ExaminationEnteritisVisceral AfferentsGastrointestinal AgentsCholangiopancreatography, Endoscopic RetrogradeCeliac ArterySplenic DiseasesAnalgesiaHerniaGastrointestinal HemorrhageNauseaSplenic Infarction