When fatigue isn't 'just being tired': what a 2026 review tells us about anaemia risk in IBD

If you live with inflammatory bowel disease, you have probably been tired in a way that "tired" doesn't quite cover. Authority guidance describes IBD as a long-term condition where parts of the digestive system become inflamed, with symptoms — diarrhoea, urgency, bloody stools, abdominal pain, and tiredness — that come and go in flares [1]. That last one, tiredness, gets less airtime than the others, even though for many people it is the symptom that quietly shapes the day.

One of the reasons tiredness gets quietly serious in IBD is anaemia. Anaemia just means there aren't enough healthy red blood cells to carry oxygen around the body well. Its most common form is iron deficiency anaemia, and authority guidance for the general population already recognises that gastrointestinal causes — IBD among them — sit on the list of why this can develop, with symptoms like tiredness, shortness of breath, or pale skin that, on their own, could be put down to any number of things [2]. The reason this matters in IBD specifically is that the two stories — "I'm having a hard week" and "my haemoglobin is sliding" — can wear the same face.

In May 2026 the journal Medicine published a study that tries to sharpen that picture: a systematic review and meta-analysis asking which factors raise the risk that someone with IBD will also have anaemia [3]. The study type matters here, so it's worth slowing down. A systematic review and meta-analysis gathers existing studies that have already asked the same question — in this case, observational studies, not new trials — and combines their findings to see what holds up across them. What it produces is a clearer view of associations in the literature so far. It is not a new experiment, and crucially it is not a personalised forecast.

That distinction is the most important one to carry away. The "risk factors" such a review surfaces are signals seen across populations: characteristics that, on average, line up with a higher chance of anaemia in people who already have IBD. For an individual patient that is genuinely useful — it tells a clinician what to look for and what to keep watching — but it is not a diagnosis, and it is not a list of things to act on alone. The same review framing makes that clear: it is mapping where anaemia in IBD tends to cluster, not telling any one person what their numbers will do [4].

So the honest summary is small and steady. Anaemia in IBD is common enough that authority guidance already names IBD on the list of reasons it can develop [2]. A 2026 review draws together what previous studies have said about which patients are more likely to be affected [3]. The useful patient move is not to self-assess — fatigue is far too non- specific for that — but to make sure anaemia is on the conversation list with the team that already knows your case: a full blood count, iron studies, and how to interpret them in the context of your disease activity. Every situation is different — check in with your own care team. None of this changes what your gastroenterology team, IBD nurse, or GP is best placed to assess for you.