What is Axial Spondyloarthritis?
Axial spondyloarthritis is the umbrella term for inflammatory disease of the spine and sacroiliac joints. It covers both ankylosing spondylitis, where damage is visible on X-ray, and the non-radiographic form, where it is not. What unites them is inflammatory back pain: stiffness that eases with movement and worsens with rest.
Also called: axSpA
Who gets Axial Spondyloarthritis?
Somewhere between 0.3 and 1 per cent of adults. Symptoms almost always begin before 45 and often in the twenties. Considering the whole spectrum rather than only ankylosing spondylitis, men and women are affected roughly equally — a correction to the older belief that this is largely a male disease, which contributed to long diagnostic delays in women.
What are the symptoms of Axial Spondyloarthritis?
Not everyone has every symptom below, and having one does not confirm the diagnosis. These are the features that most often lead to assessment:
- Back or buttock pain lasting more than three months, starting before 45
- Morning stiffness over thirty minutes
- Improvement with exercise, no improvement with rest
- Pain waking you in the second half of the night
- Alternating buttock pain
- Enthesitis — heel, chest wall, elbow or pelvic pain where tendons attach to bone
- Dactylitis, a whole swollen finger or toe
- Uveitis, psoriasis or inflammatory bowel disease
- A good response to non-steroidal anti-inflammatories
- A first-degree relative with spondyloarthritis, psoriasis, uveitis or IBD
How is Axial Spondyloarthritis diagnosed?
Diagnosis is made by pattern recognition, not by a single test. The five features of inflammatory back pain — onset under 40, insidious onset, improvement with exercise, no improvement with rest, and night pain that improves on getting up — are the starting point.
MRI of the sacroiliac joints identifies active inflammation; X-ray identifies established damage. HLA-B27 and CRP add weight. The complete picture, including the associated conditions, is what makes or excludes the diagnosis.
A hip and peripheral joint examination is included, since hip involvement affects prognosis and treatment.
How is Axial Spondyloarthritis treated?
Exercise and physiotherapy form the foundation, life-long. Regular non-steroidal anti-inflammatories are the first medicine. Biologics — TNF, interleukin-17 or JAK inhibition — are used when those are insufficient, and are highly effective.
Treatment choice is influenced by what else is present: a history of uveitis favours certain TNF inhibitors, inflammatory bowel disease rules out interleukin-17 blockade, and significant psoriasis favours agents that treat skin as well.
Smoking cessation and weight management have measurable effects on disease activity and treatment response.
Living with Axial Spondyloarthritis
This is a long-term condition managed over decades, and the pattern of care is regular review with objective measurement rather than treatment only during flares. Most patients with modern treatment work, exercise and live normally.
When should you see a rheumatologist?
Chronic back pain beginning before 45 that is worse after rest and better with movement should be assessed by a rheumatologist, whatever previous imaging has shown.
Common questions about Axial Spondyloarthritis
How is inflammatory back pain different from ordinary back pain?
Inflammatory back pain is worse after rest and better with movement, comes with morning stiffness over thirty minutes, often wakes you in the second half of the night, and typically begins before 45. Mechanical back pain is the reverse: worse with activity, better with rest.
Why did it take years to diagnose?
Back pain is extremely common and inflammatory causes are a small minority, so most patients are treated as mechanical for years. Average delay to diagnosis is still five to eight years. The specific pattern of symptoms is what triggers referral.
Does a normal MRI rule it out?
No. MRI can be normal between flares, and the diagnosis can still be made on the clinical pattern with HLA-B27 and associated features. Imaging supports the diagnosis; it does not replace assessment.
This page is general information to support a consultation. It is not a diagnosis, and it does not replace an assessment by a doctor who has examined you.