Summary Background Patients with active inflammatory bowel disease (IBD) and mental illnesses experience worse IBD outcomes. Aim To describe the incidence of mental illnesses, including deliberate self‐harm, in IBD patients. Methods A population‐based retrospective cohort study using IQVIA medical research data of a primary care database covering the whole UK, between January 1995 and January 2021. IBD patients of all ages were matched 4:1 by demographics and primary care practice to unexposed controls. Following exclusion of patients with mental ill health at study entry, adjusted hazard ratios (HR) of developing depression, anxiety, deliberate self‐harm, severe mental illness and insomnia were calculated using a Cox proportional hazards model. Results We included 48,799 incident IBD patients: 28,352 with ulcerative colitis and 20,447 with Crohn's disease. Incidence rate ratios of mental illness were higher in IBD patients than controls (all p < 0.001): deliberate self‐harm 1.31 (95% CI 1.16–1.47), anxiety 1.17 (1.11–1.24), depression 1.36 (1.31–1.42) and insomnia 1.62 (1.54–1.69). Patients with Crohn's disease were more likely to develop deliberate self‐harm HR 1.51 (95% CI 1.28–1.78), anxiety 1.38 (1.16–1.65), depression 1.36 (1.26–1.47) and insomnia 1.74 (1.62–1.86). Patients with IBD are at increased risk of deliberate self‐harm (HR 1.20 [1.07–1.35]). The incidence rate ratios of mental illnesses were particularly high during the first year following IBD diagnosis: anxiety 1.28 (1.13–1.46), depression 1.62 (1.48–1.77) and insomnia 1.99 (1.78–2.21). Conclusion Deliberate self‐harm, depression, anxiety and insomnia were more frequent among patients with IBD. IBD is independently associated with an increased risk of deliberate self‐harm.

Background Missing upper gastrointestinal cancer (UGIC) at endoscopy may prevent curative treatment. We have developed a root cause analysis system for potentially missed UGICs at endoscopy (post-endoscopy UGIC [PEUGIC]) to establish the most plausible explanations. Methods The electronic records of patients with UGIC at two National Health Service providers were examined. PEUGICs were defined as UGICs diagnosed 6–36 months after an endoscopy that did not diagnose cancer. An algorithm based on the World Endoscopy Organization post-colonoscopy colorectal cancer algorithm was developed to categorize and identify potentially avoidable PEUGICs. Results Of 1327 UGICs studied, 89 (6.7 %) were PEUGICs (patient median [IQR] age at endoscopy 73.5 (63.5–81.0); 60.7 % men). Of the PEUGICs, 40 % were diagnosed in patients with Barrett’s esophagus. PEUGICs were categorized as: A – lesion detected, adequate assessment and decision-making, but PEUGIC occurred (16.9 %); B – lesion detected, inadequate assessment or decision-making (34.8 %); C – possible missed lesion, endoscopy and decision-making adequate (8.9 %); D – possible missed lesion, endoscopy or decision-making inadequate (33.7 %); E – deviated from management pathway but appropriate (5.6 %); F – deviated inappropriately from management pathway (3.4 %). The majority of PEUGICs (71 %) were potentially avoidable and in 45 % the cancer outcome could have been different if it had been diagnosed on the initial endoscopy. There was a negative correlation between endoscopists’ mean annual number of endoscopies and the technically attributable PEUGIC rate (correlation coefficient −0.57; P = 0.004). Conclusion Missed opportunities to avoid PEUGIC were identified in 71 % of cases. Root cause analysis can standardize future investigation of PEUGIC and guide quality improvement efforts.

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