Psychiatric Disorders & IBD Diagnosis

October 14, 2026

Issue 19

Clinical Question

What is the temporal pattern of psychiatric disorder risk before and after IBD diagnosis?

Editor’s Bottom Line

Patients with IBD are at increased risk of psychiatric disorders, and their diagnosis may precede that of IBD. Clinicians managing IBD should be vigilant for mental health comorbidity, both at intake and throughout ongoing care.

Reference

Sun J, Li L, Chang Z, et al. Psychiatric Disorders Before and After Inflammatory Bowel Disease Diagnosis: A Nationwide Cohort Study in Sweden 2007 to 2023. Clin Gastroenterol Hepatol. Epub ahead of print August 6, 2026. https://doi.org/10.1016/j.cgh.2026.05.034

 

Synopsis

This nationwide cohort study linked Swedish national register data to examine temporal patterns of psychiatric disorders in patients with biopsy-confirmed IBD diagnosed between 2007 and 2023. For the primary postdiagnostic analysis, 43,862 IBD patients without prior psychiatric disorders (mean age 41.6 years; 47.3% female; 11.3% childhood-onset) were matched to 178,821 reference individuals from the general population and followed for a median of 7.4 years. A sibling-controlled cohort of 26,807 IBD patients with at least one IBD-free full sibling was used in parallel to assess whether shared familial genetics and early-life environment could explain observed associations. Models estimated hazard ratios (HRs) from five years before to 10 years after IBD diagnosis for any psychiatric disorder and for specific subtypes, including mood disorders, anxiety disorders, substance misuse, eating disorders, autism spectrum disorder (ASD), attention-deficit/hyperactivity disorder (ADHD) and psychotic disorders. Psychotropic medication use was also assessed using data from Sweden’s national prescription register.

The relative risk of any psychiatric disorder began to rise 2–3 years before IBD diagnosis (HR: 1.15; 95% Confidence Interval [CI], 1.09–1.21 at 2 years pre-diagnosis), peaked at six months post-diagnosis (HR: 1.50; 95% CI, 1.41–1.59), then declined but remained significantly elevated at 10 years (HR: 1.19; 95% CI, 1.13–1.24). Overall, 16.5% of IBD patients developed a new psychiatric disorder after diagnosis vs. 12.8% of reference individuals, corresponding to a 10-year cumulative incidence difference of 3.21%, or 1 extra case per 31 IBD patients over a decade. The risk was higher in Crohn’s disease (4.23%; 1 per 24 patients) and IBD-unclassified (4.69%; 1 per 21 patients) than in ulcerative colitis (2.43%; 1 per 41 patients). The excess was driven primarily by major depressive disorder (HR at peak: 1.70; 95% CI, 1.53–1.88; at 10 years: 1.19), anxiety disorders (HR at peak: 1.57; 95% CI, 1.44–1.71; at 10 years: 1.24) and substance misuse. Stress-related disorders were elevated after but not before IBD diagnosis. No elevated risk was observed for psychotic disorders, personality disorders or ADHD; ASD risk was modestly elevated shortly after diagnosis, as was the risk of eating disorders, beginning at five or more years after diagnosis onwards. Use of antidepressants and anxiolytics was already significantly elevated up to five years before IBD diagnosis, compared to reference individuals.

When IBD patients were compared directly with their own IBD-free full siblings, the association remained significant, suggesting IBD itself rather than shared familial predisposition is the primary driver of the elevated psychiatric risk (HR at peak: 1.47; 95% CI, 1.35–1.61; at 10 years: 1.10; 95% CI, 1.03–1.18).

Temporal patterns were consistent across sex, IBD subtype and calendar period.

Details

Study Design: Nationwide population-based cohort study with sibling-controlled comparison
Funding: Not reported
Allocation: Non-randomized
Setting: Nationwide, register-based
Level of Evidence: 2b