Looking After Your Bones When You Have IBD

Many people living with inflammatory bowel disease (IBD) focus their attention on digestive symptoms and flares, and understandably so. But bone health is often a quieter concern that develops gradually in the background, sometimes without any obvious symptoms until a fracture or a routine scan brings it to light.

What is bone health in the context of IBD?

Bone is a living tissue that is constantly being broken down and rebuilt in a process called bone remodelling. In people with Crohn’s disease or ulcerative colitis, this balance can be disrupted, leading to reduced bone density. Two related conditions can develop: osteopenia, where bone density is lower than normal, and osteoporosis, a more advanced stage where bones become fragile and more likely to fracture. Neither condition typically causes pain or symptoms on its own, which is why they are often described as silent.

Why it matters for gut inflammation

Bone health and gut inflammation are more connected than they might first appear. Chronic inflammation, malabsorption of nutrients, and some IBD treatments can all influence how bone tissue is maintained. Inflammatory signalling molecules called cytokines, which the immune system produces during active disease, can directly interfere with the cells responsible for building new bone. This means that bone loss in IBD is not simply a side effect of diet or lifestyle, it can be a direct consequence of the underlying inflammatory process itself.

Key mechanisms

Chronic inflammation and bone remodelling

During active inflammation, the body produces higher levels of cytokines such as tumour necrosis factor and interleukin-6. These molecules stimulate cells called osteoclasts, which break down old bone tissue, while also suppressing osteoblasts, the cells that build new bone. Over time, this shifts the balance towards bone loss. This is one reason why keeping inflammation under control with appropriate medical treatment is closely linked to protecting bone density, not just gut healing.

Malabsorption of calcium and vitamin D

Crohn’s disease affecting the small intestine, particularly the terminal ileum, can reduce the body’s ability to absorb calcium and fat-soluble vitamins, including vitamin D. Vitamin D is essential for calcium absorption in the gut and for regulating bone mineralisation. Reduced absorption, combined with lower dietary intake during flares when appetite is poor, can leave bone tissue without the raw materials it needs to stay strong.

Corticosteroid use

Corticosteroids, such as prednisolone, are effective at settling inflammation quickly but can have a notable effect on bone density when used repeatedly or for extended periods. They reduce calcium absorption in the gut, increase calcium loss through the kidneys, and directly suppress bone-forming cells. This is one of the reasons gastroenterologists generally aim to use corticosteroids for the shortest effective duration and to consider bone-protective strategies alongside their use.

Reduced physical activity

Fatigue, joint pain, and general unwellness during flares can lead to reduced physical activity. Weight-bearing movement helps stimulate bone formation, so periods of reduced mobility, especially if repeated over years, can compound the effects of inflammation and medication on bone density.

Low body weight and hormonal changes

Some people with IBD experience unintentional weight loss or reduced body fat, which can affect hormone levels, including oestrogen, that play a protective role in maintaining bone density. This is particularly relevant for younger patients whose bones are still developing peak density, typically achieved by the late twenties.

It is worth remembering that reduced bone density does not cause day-to-day symptoms in most cases, and joint or bone discomfort during a flare does not necessarily mean bone density has changed. Bone health is usually assessed through a dual-energy X-ray absorptiometry (DEXA) scan, a low-radiation imaging test that measures bone mineral density, rather than through symptoms alone. This article is not a substitute for medical care, and any concerns about bone health should be discussed with a gastroenterologist or specialist IBD team, who may recommend monitoring or specific treatment based on individual risk factors.

Practical Takeaways

• Ask your IBD team whether a DEXA scan is appropriate, particularly if you have had repeated courses of corticosteroids or long-standing Crohn’s disease affecting the small intestine.
• Aim for consistent, adequate intake of calcium and vitamin D through diet and, where advised by a healthcare professional, supplementation.
• Include regular weight-bearing activity, such as walking or light resistance exercises, as tolerated during periods of remission.
• Discuss corticosteroid use with your specialist, including how long you have used them and whether alternatives or bone-protective measures are appropriate.
• Avoid smoking and limit alcohol intake, as both are independently associated with reduced bone density.
• Keep inflammation as well controlled as possible through consistent use of prescribed IBD treatment, since ongoing inflammation itself contributes to bone loss.

Conclusion

Bone health in IBD is shaped by a combination of chronic inflammation, nutrient absorption, medication use, and activity levels, and it tends to change gradually over years rather than suddenly. Because bone loss often has no obvious symptoms, regular monitoring and open conversation with your IBD team are important parts of long-term care. Managing inflammation consistently, supporting nutrient intake, and staying physically active where possible all contribute to bone stability over time. These measures work alongside, not instead of, medical treatment for IBD itself.

References

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5. Miznerova E, Hlavaty T, Koller T, et al. The prevalence and risk factors for osteoporosis in patients with inflammatory bowel disease. Bratisl Lek Listy. 2013;114(8):439-445.
6. Pigot F, Roux C, Chaussade S, et al. Low bone mineral density in patients with inflammatory bowel disease. Dig Dis Sci. 1992;37(9):1396-1403. doi:10.1007/BF01296010
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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.

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