Inflammatory Bowel Disease and Risk of More than 1,500 Comorbidities: A Disease-wide Prediagnostic and Postdiagnostic Phenomic Association Study.

Introduction: Inflammatory bowel disease (IBD) is associated with various extraintestinal manifestations. We aimed to identify comorbidities in IBD and the timing of their development to provide potentially useful insight into the associations with IBD.

Methods: We conducted a population and disease-wide phenomic association study in IBD, using >6 million International Classification of Diseases, Tenth Revision coded healthcare contacts from 10 years before and up-to 17 years after IBD diagnosis to investigate associations with 1,583 comorbidities.

Prevalence and Prognosis of Mild Inflammatory Bowel Disease: A Population-based Cohort Study, 1997-2020.

Background & Aims: The inflammatory bowel diseases (IBDs), ulcerative colitis (UC) and Crohn's disease (CD), are heterogenous diseases ranging from mild to severe. We aimed to describe the prevalence and prognosis of mild IBD in an unselected population-based patient cohort.

Methods: We identified all individuals diagnosed with IBD during 1997 to 2020 in North Denmark (n = 4607).

Risk of inflammatory bowel disease following hospitalisation with infectious mononucleosis: nationwide cohort study from Denmark.

Infectious mononucleosis (IM) is suspected to be associated with inflammatory bowel disease (IBD) development. Using a Danish nationwide cohort of people developing severe IM and their age-, sex-, and socioeconomic (SES) index-matched counterparts, we investigated the subsequent risk of IBD, Crohn's disease (CD), or ulcerative colitis (UC) development from 1977 to 2021. Among 39,684 severe IM patients we find a sex-, age-, and SES index-adjusted HR for IBD of 1.