Abdominal PainDeath, SuddenDeath, Sudden, CardiacPainSudden Infant DeathChronic PainPain ManagementAbdomen, AcutePain ThresholdPain, PostoperativePain MeasurementBack PainPain, IntractableLow Back PainNeck PainPelvic PainAcute PainPain PerceptionAppendicitisFacial PainIrritable Bowel SyndromePain, ReferredGastrointestinal DiseasesConstipationIleal DiseasesTomography, X-Ray ComputedTreatment OutcomeTorsion AbnormalityAbdomenShoulder PainMusculoskeletal PainColonic Diseases, FunctionalChronic DiseaseIntestinal ObstructionRadiography, AbdominalRupture, SpontaneousColitis, IschemicPancreatitisIntestinal PerforationVisceral PainAnalgesicsProspective StudiesRetrospective StudiesCecal DiseasesIntussusceptionFollow-Up StudiesJejunal DiseasesAcute DiseaseFatal OutcomeColonic DiseasesNociceptive PainNeuralgiaLaparotomyPancreatitis, ChronicHemoperitoneumAnalgesics, OpioidArrhythmias, CardiacFlatulenceTime FactorsDiarrheaAppendectomyRisk FactorsRecurrenceVomitingEndoscopy, Digestive SystemAppendixMesenteric Vascular OcclusionColicQuestionnairesLaparoscopyHyperalgesiaDiverticulitisCholecystitisDiagnostic ErrorsSeverity of Illness IndexDefecationDouble-Blind MethodHeadacheEndoscopy, GastrointestinalColonoscopyPeritonitis, TuberculousMesenteric LymphadenitisDuodenal DiseasesMyofascial Pain SyndromesArthralgiaIntestinal DiseasesHymenComplex Regional Pain SyndromesSyndromeHematocolposAutopsyMesenteric Artery, SuperiorFlank PainPeritoneal DiseasesPurpura, Schoenlein-HenochSplenic InfarctionTachycardia, VentricularVisceral AfferentsPredictive Value of TestsGastrointestinal Agents