Abdomen, AcuteAbdominal PainAppendicitisTorsion AbnormalityAcute PainDiverticulitisMesenteric LymphadenitisDiagnostic ErrorsRadiography, AbdominalDiagnosis, Computer-AssistedJejunal DiseasesCholecystitisPainAcute DiseaseRupture, SpontaneousColonic DiseasesAppendectomyEnteritisIntestinal ObstructionAbdomenPeptic Ulcer PerforationMedical History TakingPancreatitisTomography, X-Ray ComputedPeritoneal DiseasesPhysical ExaminationChronic PainPain ManagementProspective StudiesAmylasesPain ThresholdSensitivity and SpecificityAntibodies, AntiphospholipidEmergency Service, HospitalPain, PostoperativePain MeasurementRetrospective StudiesBack PainLow Back PainPain, IntractableNeck PainPelvic PainPain PerceptionFacial PainDelayed DiagnosisGastrointestinal DiseasesIrritable Bowel SyndromeTreatment OutcomePain, ReferredEarly DiagnosisConstipationPrenatal DiagnosisIleal DiseasesShoulder PainChronic DiseaseMusculoskeletal PainColonic Diseases, FunctionalFollow-Up StudiesColitis, IschemicIntestinal PerforationFatal OutcomeCecal DiseasesAnalgesicsIntussusceptionTime FactorsDiagnosisVisceral PainBiopsyLaparotomySeverity of Illness IndexRecurrencePredictive Value of TestsQuestionnairesPancreatitis, ChronicDiarrheaAppendixRisk FactorsNeuralgiaMagnetic Resonance ImagingEndoscopy, GastrointestinalNociceptive PainVomitingLaparoscopyAnalgesics, OpioidFlatulenceHemoperitoneumPrognosisColicMesenteric Vascular OcclusionReproducibility of ResultsColonoscopyPrevalenceEndoscopy, Digestive System