Neuropsychiatric comorbidity in inflammatory bowel disease is usually explained as understandable distress: a chronic, unpredictable, stigmatising illness produces anxiety and depression. This review sets out the case that a substantial part of it is secondary to disrupted gut-brain communication — a consequence of the disease process rather than of living with it.
The proposed mechanisms are the familiar components of the gut-brain axis operating in the wrong direction: intestinal microbiota imbalance, barrier damage with translocation of microbial products, neuroinflammation and systemic immune activation, and disturbance of neuroendocrine pathways. The review maps these onto the spectrum of neuropsychiatric and neurological presentations seen in these patients, of which anxiety and depression are the commonest but not the only ones.
The practical consequence is in how the clinic is organised. If low mood in IBD is purely reactive, screening for it is good holistic care and treating it is someone else's job. If part of it is generated by the disease, then it belongs in the gastroenterology consultation, it should be recorded and tracked like any other manifestation, and its relationship to disease activity is worth actively examining — because a patient whose mood deteriorates may be telling you about their bowel.
So screen routinely, with a validated instrument rather than an impression, and treat a change in mood as a possible marker of activity rather than as a separate problem to refer onwards.
- Screen for anxiety and depression at IBD review with a validated instrument, not by impression
- Record the score alongside disease activity so the two can be compared over time
- Treat deteriorating mood as a possible signal of disease activity, not only as a psychological issue
- Refer for psychological support without implying the symptoms are separate from the IBD
- Note that this is a mechanistic review; no screening or treatment trial is reported
Why it matters
It moves neuropsychiatric symptoms in IBD from the margins of the consultation into the list of things the gastroenterologist is responsible for tracking.
Don't overread it
This is a mechanistic review of pathways; it does not demonstrate that treating the gut improves mood or that screening changes outcomes.
Read the rest in the app
You have read your two free briefings this month. The app carries all 27 specialties, every morning, free — and this finding is waiting in it.
Scan to keep reading on your phone. No account needed to start.
Tomorrow morning, before your first patient
One edition a day for gastroenterology & hepatology, written by the desk, every claim tied to its paper. Six minutes.
Get the app — free