Ankylosing spondylitis is part of a broader spectrum now called axial spondyloarthritis (axSpA). It mainly causes inflammation around the sacroiliac joints—where the spine meets the pelvis—and the spine itself. Some people have changes visible on X-ray (radiographic axSpA/ankylosing spondylitis); others have symptoms and MRI inflammation before X-ray changes appear (non-radiographic axSpA).
The disease often begins before age 45. It affects women as well as men, although women may have less typical imaging and experience diagnostic delay.
Inflammatory back pain: clues to notice
No single symptom proves axSpA, but suspicion rises when several features occur together:
- back pain beginning before age 45 and lasting over three months;
- improvement with movement but little improvement with rest;
- waking in the second half of the night because of pain;
- alternating deep buttock pain;
- good response to an NSAID within 48 hours;
- heel pain at the Achilles tendon or plantar fascia;
- current or past psoriasis, inflammatory bowel disease or uveitis; or
- a close relative with spondyloarthritis.
Mechanical back pain is more often linked to a particular movement, strain or position and tends to improve with rest, but real-life patterns overlap. Clinical assessment matters.
Symptoms beyond the spine
AxSpA can affect hips and other joints, tendon attachments (enthesitis), skin, bowel and eyes. Reduced chest expansion can develop when rib-spine joints are inflamed. Severe weakness, bladder or bowel change, saddle numbness, major trauma, fever, unexplained weight loss or cancer history are back-pain red flags requiring urgent medical assessment.
A sudden red, painful eye with light sensitivity or blurred vision can be acute anterior uveitis. NICE recommends same-day ophthalmology assessment.
What does HLA-B27 mean?
HLA-B27 is a genetic marker associated with axSpA. A positive result makes the diagnosis more likely when typical symptoms are present, but it is not diagnostic by itself. Many healthy carriers never develop axSpA, and a negative result does not rule it out. Prevalence varies considerably by ancestry and region.
X-ray, MRI and diagnosis
A pelvis X-ray may show sacroiliitis in established disease but can be normal early. If suspicion remains, an MRI using an inflammatory back-pain protocol can look for active inflammation and structural lesions. MRI findings also need expert interpretation because stress, sport, pregnancy and other conditions can mimic inflammation.
ESR and CRP may support the assessment but can be normal. Diagnosis should be made or confirmed by a rheumatologist using the whole clinical picture, not a scan or blood test in isolation.
Treatment: preserving movement and controlling inflammation
Exercise and physiotherapy
Regular exercise is a cornerstone of care. A programme may include spinal mobility, posture, deep breathing, strengthening and aerobic activity. Swimming, walking and cycling are useful options for many people, but there is no single “best” exercise for everyone. Supervised physiotherapy can be more effective than unsupervised home exercise and is especially useful when mobility is limited.
Blanket bans on running, squats or gym training are rarely helpful. Load and technique should be adapted to symptoms, fitness, balance, osteoporosis or spinal fusion. Contact sports and high-impact work may need specialist advice when the spine is rigid or fragile.
Stop smoking and tobacco: smoking is associated with worse function and structural progression.
Medicines
NSAIDs are usually the first medicine for pain and stiffness, after reviewing stomach, kidney, heart and blood-pressure risk. They should be used at an appropriate dose under clinical guidance.
If disease remains active despite non-drug care and adequate trials of conventional treatment, a rheumatologist may consider a biologic (TNF or IL-17 inhibitor) or a targeted medicine such as a JAK inhibitor. Objective inflammation, associated psoriasis/bowel/eye disease, infection screening and individual risk influence the choice. These medicines need specialist monitoring.
Frequently asked questions
Does a positive HLA-B27 test prove ankylosing spondylitis?
No. HLA-B27 supports the diagnosis in the right clinical setting, but many carriers never develop disease and some people with axial spondyloarthritis are HLA-B27-negative.
Can people with axial spondyloarthritis go to the gym or run?
Many can remain active. Exercise should be individualized for disease activity, mobility and any structural damage; supervised physiotherapy can help select safe mobility, strength, posture and aerobic work.
What should I do if my eye suddenly becomes red and painful?
A red painful eye with light sensitivity or blurred vision may be acute anterior uveitis. Seek same-day ophthalmology assessment rather than using unsupervised eye drops.
Where can young-onset inflammatory back pain be assessed in Patna?
Dr. Pratyush Kumar can assess the symptom pattern and arrange initial tests, while suspected axial spondyloarthritis should be confirmed and treatment directed by a rheumatologist. Request an appointment.
Medical references
This article is for health education and does not replace an individual medical consultation. Symptoms, test results, medicines, and treatment decisions should be discussed with a qualified clinician.
Seek urgent medical care for severe breathing difficulty, chest pain, confusion, fainting, uncontrolled bleeding, severe dehydration, or rapidly worsening symptoms.