Gastrointestinal DiseasesDepressionPrevalenceQuestionnairesSeverity of Illness IndexPsychiatric Status Rating ScalesBehavioral SymptomsSymptom AssessmentAnxietyRisk FactorsTreatment OutcomeDepressive DisorderProspective StudiesQuality of LifeCross-Sectional StudiesHallucinationsFollow-Up StudiesTime FactorsUrination DisordersFatigueComorbidityAffective SymptomsGastroesophageal RefluxDelusionsLongitudinal StudiesPainConversion DisorderPsychotic DisordersPsychophysiologic DisordersCoughSchizophreniaCognition DisordersConstipationStress, PsychologicalIrritable Bowel SyndromeRetrospective StudiesSchizophrenic PsychologyAge FactorsAsthmaMagnetic Resonance ImagingSleep DisordersStress Disorders, Post-TraumaticCohort StudiesPremenstrual SyndromeHot FlashesIrritable MoodDyspneaSex FactorsNeuropsychological TestsNervous System DiseasesOccupational DiseasesDizzinessChronic DiseaseTomography, X-Ray ComputedDyspepsiaSyndromeHeartburnSomatoform DisordersAntidepressive AgentsPsychometricsDiagnostic and Statistical Manual of Mental DisordersPersonality InventoryAnxiety DisordersSleep Disorders, IntrinsicLower Urinary Tract SymptomsMental DisordersDyspareuniaRespiration DisordersDiagnostic Techniques, Digestive SystemAbdominal PainCase-Control StudiesDepressive Disorder, MajorPrognosisLogistic ModelsRegression AnalysisColonic Diseases, FunctionalBipolar DisorderDelayed DiagnosisMusculoskeletal DiseasesHealth SurveysMood DisordersAffectDissociative DisordersParesthesiaPredictive Value of TestsSelf ReportUnited StatesSleep Initiation and Maintenance DisordersIncidenceRespiratory SoundsHealth StatusRecurrenceAcute DiseaseRespiratory Tract DiseasesParkinson DiseaseEsophageal DiseasesVomitingDisease ProgressionHypochondriasisUrologic Diseases