Fatigue is one of the most common and debilitating symptoms reported by people living with inflammatory bowel disease (IBD). It can persist even when the gut appears calm, affecting work, relationships, and quality of life. Understanding why fatigue occurs in IBD, and what can be done to address it, is essential for managing life with Crohn’s disease or ulcerative colitis.
What is IBD-related fatigue?
Fatigue in IBD is not simply feeling tired after a poor night’s sleep. It is a persistent, overwhelming sense of exhaustion that does not improve significantly with rest. It can be physical, cognitive, or both, and often varies in intensity from day to day. Unlike ordinary tiredness, IBD-related fatigue can interfere with basic daily activities and does not respond predictably to sleep or rest alone.
This type of fatigue is common across both Crohn’s disease and ulcerative colitis, occurring during active inflammation and during clinical remission. It is influenced by multiple factors, including immune system activity, nutrient deficiencies, disrupted sleep, medication side effects, and the cumulative burden of living with a chronic condition.
Why fatigue occurs in IBD
Chronic inflammation
Even low-grade inflammation, which may not cause obvious gut symptoms, can drive fatigue. When the immune system is activated, the body produces signalling molecules called cytokines. Pro-inflammatory cytokines such as interleukin-6 (IL-6) and tumour necrosis factor alpha (TNF-alpha) can act on the brain and muscles, reducing energy levels and altering how the body uses fuel. This is sometimes described as ‘sickness behaviour’, a protective state that conserves energy during illness but becomes problematic when inflammation is ongoing.
Anaemia and nutrient deficiencies
Anaemia, in which the blood does not carry enough oxygen, is a frequent cause of fatigue in IBD. It can result from blood loss through the gut, poor iron absorption, or inflammation that interferes with how the body stores and uses iron. Deficiencies in B12 and folate can also contribute, especially in people with Crohn’s disease affecting the small bowel. Vitamin D deficiency, common in IBD, has also been linked to fatigue.
Gut-brain signalling
The gut and brain communicate constantly through the vagus nerve, immune signals, and the microbiome. Inflammatory changes in the gut can alter this communication, influencing mood, motivation, and energy regulation. The gut microbiome, often disrupted in IBD, produces metabolites such as short-chain fatty acids that can affect brain function. Dysbiosis, an imbalance in gut bacteria, may contribute to both fatigue and mood changes.
Sleep disruption
Pain, diarrhoea, urgency, and anxiety can all interfere with sleep quality. Even when total sleep time is adequate, frequent waking or poor sleep architecture can leave people feeling unrefreshed. Sleep disturbance is common during flares but can persist in remission, particularly if pain or bowel symptoms continue or if stress remains high.
Medication effects
Some IBD medications can contribute to fatigue. Corticosteroids can disrupt sleep and cause muscle weakness. Biologics and immunosuppressants may cause tiredness as a side effect, though this varies between individuals. Iron supplements, while necessary for anaemia, can sometimes cause nausea or constipation, which may indirectly worsen fatigue.
Practical strategies to address fatigue
Identify and treat anaemia and deficiencies
Work with your healthcare team to check for anaemia and deficiencies in iron, B12, folate, and vitamin D. Blood tests can identify these issues, and treatment with oral or intravenous supplements can make a meaningful difference. Intravenous iron is often more effective in IBD-related anaemia than oral forms, particularly when inflammation is present, as inflammation reduces iron absorption from the gut.
Prioritise anti-inflammatory eating patterns
A diet that supports stable blood sugar and reduces inflammatory load can help manage energy levels. Focus on whole foods such as oily fish, leafy greens, root vegetables, eggs, and lean protein. Omega-3 fatty acids, found in fish such as salmon, mackerel, and sardines, can support the resolution of inflammation and may help reduce fatigue over time. Avoid long gaps between meals, and include protein and fat with carbohydrates to slow digestion and prevent energy crashes.
Manage activity and rest
Pacing is key. Rather than pushing through fatigue or collapsing into inactivity, aim for consistent, moderate activity that does not trigger exhaustion. Short walks, stretching, or gentle movement can support circulation and mood without overtaxing the body. Rest should be planned rather than reactive. Schedule rest periods before fatigue becomes overwhelming.
Address sleep quality
Create a consistent sleep routine with regular bed and wake times. Avoid screens and bright light in the hour before bed. If pain or bowel symptoms disrupt sleep, speak to your healthcare team about symptom control. Cognitive behavioural therapy for insomnia (CBT-I) has been shown to improve sleep in people with chronic illness and may be helpful for IBD-related sleep problems.
Monitor and manage inflammation
Fatigue does not always correlate with gut symptoms, so it is important to monitor inflammation using objective markers such as faecal calprotectin or C-reactive protein (CRP). Persistent fatigue in the absence of obvious symptoms may signal low-grade inflammation requiring treatment adjustment. Work with your gastroenterologist to ensure inflammation is adequately controlled.
Consider psychological and social factors
Chronic illness is tiring emotionally as well as physically. Anxiety, depression, and the daily effort of managing a condition all contribute to fatigue. Psychological support, whether through counselling, cognitive behavioural therapy, or peer support, can help reduce this burden. Social isolation and financial stress also play a role and should be addressed where possible.
Practical takeaways
- Have blood tests to check for anaemia, iron, B12, folate, and vitamin D, and treat deficiencies with your healthcare team.
- Eat regular meals with a balance of protein, healthy fats, and whole carbohydrates to support stable energy.
- Include oily fish in your diet at least twice a week to support anti-inflammatory processes.
- Pace activity throughout the day and plan rest before you become exhausted.
- Establish a consistent sleep routine and address any symptoms that interfere with sleep.
- Monitor inflammation using objective markers, even if gut symptoms are mild or absent.
Conclusion
Fatigue in IBD is complex and multifactorial, but it is not inevitable. By addressing inflammation, correcting deficiencies, supporting sleep, and pacing activity, many people can regain meaningful energy and function. Fatigue should be taken seriously and discussed openly with your healthcare team. It is not a sign of weakness or poor coping, it is a legitimate symptom that deserves attention and treatment.
References
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- Goodhand JR, Kamperidis N, Rao A, et al. Prevalence and management of anemia in children, adolescents, and adults with inflammatory bowel disease. Inflamm Bowel Dis. 2012;18(3):513-519. doi:10.1002/ibd.21740
- Battat R, Kopylov U, Szilagyi A, et al. Vitamin B12 deficiency in inflammatory bowel disease: a prospective observational pilot study. Eur J Gastroenterol Hepatol. 2014;26(12):1361-1367. doi:10.1097/MEG.0000000000000226
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This article is intended for informational and educational purposes only. It does not constitute medical advice and should not be used as a substitute for professional medical guidance, diagnosis, or treatment.