What happens in your gut
When you live with Crohn’s disease or ulcerative colitis, keeping inflammation under control is one of the main goals of treatment. Medicines work to calm the immune response in the gut, but many people wonder whether other parts of daily life, like exercise, might also play a role. The relationship between physical activity and gut inflammation is more complicated than it might first appear.
What is gut inflammation in IBD?
In inflammatory bowel disease, the immune system is overactive in the gut. It treats harmless substances, such as food or gut bacteria, as threats and produces an ongoing inflammatory response. This inflammation damages the gut lining, causing symptoms such as diarrhoea, abdominal pain, fatigue, and sometimes bleeding. Even when symptoms improve, inflammation may still be present, which is why monitoring gut health with scopes or blood tests remains important.
Why exercise matters in IBD
Regular physical activity is generally good for health. It supports the heart, bones, mental wellbeing, and muscle strength. For people with IBD, staying active may also have indirect benefits for overall health and quality of life. However, the direct effect of exercise on inflammation inside the gut is less clear and depends on the type, intensity, and duration of activity.
What may be happening in the body
The effect of moderate exercise
Research suggests that moderate physical activity, such as walking, cycling, swimming, or gentle jogging, may have a calming effect on inflammation elsewhere in the body. This is thought to happen because regular movement helps regulate immune signals and may reduce the release of inflammatory substances into the bloodstream. Some studies have found that people with IBD who stay moderately active report better wellbeing and fewer symptom flares, although this does not always mean the inflammation in the gut has reduced.
The risk of intense exercise
At the other end of the scale, very intense or prolonged exercise may temporarily increase inflammation in the body. Endurance activities, such as long-distance running or high-intensity training, can place stress on the body and may trigger a short-term inflammatory response. For people with IBD, this type of stress may occasionally worsen symptoms or disrupt gut function, particularly if the disease is already active. The gut may also become more vulnerable to reduced blood flow during very intense exercise, which can affect how well it works.
Gut bacteria and movement
Physical activity may also influence the types of bacteria that live in the gut. Some research has found that people who exercise regularly tend to have more diverse gut bacteria, which is generally thought to support a healthier gut environment. However, it is not yet clear whether this change has a direct effect on inflammation in people with Crohn’s disease or ulcerative colitis, or whether it simply reflects other aspects of a healthy lifestyle.
The role of stress and wellbeing
Exercise is known to help manage stress, improve mood, and support better sleep, all of which can be helpful for people with IBD. Stress does not cause IBD, but it may influence symptom flares in some people. By helping to regulate the body’s stress response, regular movement may indirectly support more stable gut health over time.
What this means for you
If you have IBD, moderate and consistent physical activity is generally safe and may offer several benefits. It is not a replacement for medical treatment, and it will not stop inflammation on its own, but it may support your overall health and help you feel more in control. The key is finding a level of activity that feels manageable and does not leave you exhausted or unwell.
If your disease is in remission or well controlled, most people can take part in normal levels of activity. If you are experiencing a flare, very intense exercise may not be helpful, and rest may be more appropriate. It is always worth discussing your activity level with your IBD team, particularly if you are unsure what is safe or appropriate for your situation.
Practical takeaways
- Moderate activity, such as walking, swimming, or cycling, may support overall wellbeing without placing too much stress on the body.
- Very intense or prolonged exercise may temporarily increase inflammation and may not be suitable during a flare.
- Consistency is more helpful than intensity. Regular, gentle movement is often better than occasional bursts of high-effort activity.
- Listen to your body. If exercise leaves you feeling drained, unwell, or worsens your symptoms, it may be worth adjusting your routine.
- Discuss your activity level with your IBD team, particularly if your disease is active or you are recovering from a flare.
- Exercise supports mental health, stress management, and quality of life, all of which can be valuable when living with a long-term condition.
Conclusion
Exercise does not treat IBD or replace the need for medical therapy, but staying active in a way that suits your body may support your overall health and wellbeing. Moderate, regular movement is generally safe and may have indirect benefits for inflammation and gut health. Very intense activity may not always be helpful, particularly during a flare. The best approach is one that feels sustainable, does not worsen your symptoms, and fits your current health and treatment plan. Your IBD team can help you find the right balance.
References
- Bilski J, Mazur-Bialy A, Wojcik D, et al. The impact of physical activity and nutrition on inflammatory bowel disease: the potential role of cross talk between adipose tissue and skeletal muscle. J Physiol Pharmacol. 2013;64(2):143-155.
- Eckert KG, Abbasi-Neureither I, Köppel M, Huber G. Structured physical activity interventions as a complementary therapy for patients with inflammatory bowel disease: a scoping review and practical implications. BMC Gastroenterol. 2019;19(1):115.
- Narula N, Fedorak RN. Exercise and inflammatory bowel disease. Can J Gastroenterol. 2008;22(5):497-504.
- Cook MD, Allen JM, Pence BD, et al. Exercise and gut immune function: evidence of alterations in colon immune cell homeostasis and microbiome characteristics with exercise training. Immunol Cell Biol. 2016;94(2):158-163.
- Ng SC, Shi HY, Hamidi N, et al. Worldwide incidence and prevalence of inflammatory bowel disease in the 21st century: a systematic review of population-based studies. Lancet. 2017;390(10114):2769-2778.
- DeFilippis EM, Tabani S, Warren RU, Christos PJ, Bosworth BP, Scherl EJ. Exercise and self-reported limitations in patients with inflammatory bowel disease. Dig Dis Sci. 2016;61(1):215-220.
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.