Enteropathic arthritis (IBD-associated)

Enteropathic arthritis is inflammation of the joints and entheses, the points where tendons attach to bone, driven by the same immune process that inflames the bowel in inflammatory bowel disease. The leading explanation is that inflammation arising in the gut wall spills over to affect the joints and spine, so the two organs share one underlying disease rather than two separate problems.

There is no single cause, and it is not something you brought on yourself. A genetic predisposition plays a part, and the marker HLA-B27 is associated particularly with spinal involvement, although many affected people do not carry it. It belongs to the spondyloarthritis family alongside psoriatic arthritis and axial spondyloarthritis. It is most often seen in people who already have Crohn's disease or ulcerative colitis, but the joints can occasionally flare first.

Enteropathic arthritis can affect the joints in different ways. Features may include:

• Pain and swelling in the joints of the arms and legs, sometimes flaring with bowel symptoms
• Back or buttock pain and stiffness when the spine is involved, often worse with rest and better with movement
• Pain where tendons attach to bone, such as the heel
• Swelling of a whole finger or toe

Diagnosis brings together your joint symptoms, any history of inflammatory bowel disease, an examination and appropriate tests and imaging. Recognising the link between the gut and the joints is central, and sometimes the joint symptoms appear before the bowel condition is known.

Ultrasound can help assess inflammation in the joints and where tendons attach to bone. Dr Borukhson uses point-of-care ultrasound during the consultation, so relevant areas can often be examined in the same visit. You can read more on the ultrasound clinic page.

The aim is to control the joint inflammation while taking the bowel condition into account, since some treatments affect both. Care is individual and often works best when the rheumatology and gastroenterology aspects are coordinated. Where a particular joint is troublesome, an ultrasound-guided injection may help.

Medicines are chosen with the bowel in mind. Anti-inflammatory tablets (NSAIDs) can ease joint symptoms but are used sparingly, as they can sometimes upset the bowel. Where more is needed, treatment is often steered towards options that help the joints and the gut together: disease-modifying tablets (DMARDs) such as sulfasalazine and methotrexate, and, in more active or persistent disease, biologic medicines such as anti-TNF therapies, several of which treat inflammatory bowel disease as well as the joints. Some drugs used for related types of arthritis can aggravate the bowel and are generally avoided here. Any DMARD or biologic involves regular monitoring, and screening is carried out before biologics begin. The plan is agreed with you and coordinated with your bowel care.

Looking after the bowel and the joints together tends to serve both. Keeping in regular contact with your gastroenterology team, attending review and taking IBD treatment as agreed all help, since settling gut inflammation often eases the joints.

• Keep moving with regular gentle activity and stretches; physiotherapy is valuable where the spine is involved
• Treat over-the-counter anti-inflammatory tablets with caution, as they can unsettle the bowel, and check before using them
• Not smoking is especially worthwhile, as smoking can worsen Crohn's disease
• Pace yourself during flares and rest sore joints, then build activity back up

The outlook is generally good. For many people the condition settles or runs a relapsing course that responds well to treatment, and with coordinated care most stay active.

Most joint symptoms can wait for a routine rheumatology or gastroenterology review, but a few warrant prompt attention. Seek urgent same-day advice if a single joint becomes hot, very swollen and acutely painful, especially with fever, as infection must be excluded. A new painful red eye with light sensitivity needs same-day ophthalmology assessment, since this spondyloarthritis-related uveitis can threaten sight.

Contact your team promptly if you notice new or worsening bowel symptoms such as bleeding, persistent diarrhoea or significant weight loss, or if back and joint pain flares despite treatment. Tell whoever prescribes your medicines about fever, unusual infections or being unwell while on a DMARD or biologic. When in doubt, it is always reasonable to ask.

Because enteropathic arthritis involves both the joints and the gut, an assessment that considers the whole picture, and coordinates care across specialties where needed, gives the best result. If you have inflammatory bowel disease and develop joint pain, swelling or inflammatory back pain, a specialist review is worthwhile.

How is enteropathic arthritis diagnosed?

Diagnosis brings together your joint symptoms, any history of Crohn's disease or ulcerative colitis, an examination and appropriate tests and imaging. Recognising the link between the gut and the joints is central, and sometimes the joint symptoms appear before the bowel condition is known. Ultrasound can help show inflammation in the joints and where tendons attach to bone. Dr Borukhson uses point-of-care ultrasound during the consultation, so relevant areas can often be examined in the same visit.

Do my joint symptoms mean my bowel disease is flaring?

Sometimes the joints flare in step with the bowel, and settling the gut inflammation can ease the joints too. At other times the joint and spinal symptoms run their own course and need treatment in their own right. This is exactly why a coordinated assessment helps, looking at the whole picture so that joint pain is not simply assumed to follow the bowel, and the right treatment is chosen for each.

Why does treatment need to take my bowel condition into account?

Because the same body is affected, some medicines help the joints and the gut together, while others can upset the bowel. Anti-inflammatory tablets are used sparingly for this reason, and a few drugs used for related forms of arthritis are generally avoided here. Treatment is often steered towards options that address both, and the plan is agreed with you and coordinated with your bowel care so the two are not pulling in different directions.

Should I see a rheumatologist if I already have a gastroenterologist?

Yes, the two roles complement each other. Your gastroenterologist looks after the bowel, while a rheumatologist assesses whether the joints or spine are involved and guides treatment for them. Joined-up care across both specialties tends to give the best result. If you have inflammatory bowel disease and develop joint pain, swelling or inflammatory back pain that is worse with rest and better with movement, a specialist rheumatology review is worthwhile.

How does enteropathic arthritis differ from ordinary wear-and-tear joint pain?

Enteropathic arthritis is inflammatory rather than mechanical, so the stiffness is often worse after rest and eases with movement, and there can be swelling of a joint or a whole finger or toe, or pain where tendons attach to bone such as the heel. It belongs to the same family as psoriatic arthritis and axial spondyloarthritis. An assessment, with ultrasound where helpful, can tell inflammation apart from everyday wear and tear.