Axial Spondyloarthritis: Symptoms, Treatment and Questions to Ask

If your lower back has been stiff and sore for months, and the stiffness eases once you start moving, you are asking the right question. Axial spondyloarthritis (axSpA) is a long-term inflammatory condition that mainly affects the spine and the joints where the spine meets the pelvis, and it often starts as back pain. It is diagnosed from a mix of symptoms, blood tests and imaging, so the best next step is a rheumatologist, a doctor who specialises in arthritis and related inflammatory conditions.

What is axial spondyloarthritis?

Axial spondyloarthritis is the umbrella term. A 2017 Lancet review says it covers both non-radiographic and radiographic forms, and that the radiographic form is also called ankylosing spondylitis (Lancet 2017 review). A 2025 JAMA review describes it as an immune-mediated inflammatory condition that involves the sacroiliac joints (where the base of the spine meets the pelvis), the spine and sometimes peripheral joints. It estimates that about 1% of US adults have it (JAMA 2025 review).

What is spondylitis?

Spondylitis means inflammation of the spine. As of November 2026, the NIAMS ankylosing spondylitis page says ankylosing spondylitis is a type of arthritis that causes inflammation in the joints and ligaments of the spine. It may also affect peripheral joints such as the knees, ankles and hips. In severe cases the spine’s bones can fuse, which makes the spine rigid.

What is enthesitis?

Enthesitis is inflammation where tendons and ligaments attach to bone. The 2025 JAMA review lists it among the features that can occur beyond the spine, along with inflammatory arthritis (most often in the knees), uveitis (eye inflammation), psoriasis and inflammatory bowel disease. A separate 2025 Lancet review groups enthesitis with arthritis and dactylitis as peripheral features (Lancet 2025 review).

What is non-radiographic axial spondyloarthritis?

Non-radiographic axial spondyloarthritis (nr-axSpA) is the form where x-rays of the sacroiliac joints do not show the definite damage seen in ankylosing spondylitis. The name is confusing, and the term itself is a common source of mix-ups. The Spondylitis Association of America article explains that nr-axSpA and ankylosing spondylitis are “two ends of the same disease spectrum,” with one showing less or no joint damage on x-ray and the other showing definite damage. The same article notes that not every nr-axSpA case progresses to ankylosing spondylitis. Cohort studies it cites found progression rates of 5% to 30% over 2 to 30 years, and progression is hard to predict for one person.

The SAA article also says the typical symptoms of nr-axSpA do not depend on how much joint damage shows on x-ray. That is why the symptom pattern below matters so much.

Symptoms of axial spondyloarthritis

What is the hallmark symptom?

The hallmark is inflammatory chronic back pain. The JAMA 2025 review calls it the most common symptom and says it affects more than 80% of patients. Its usual pattern is gradual onset before age 45, prolonged morning stiffness, improvement with exercise, and no improvement with rest. The Lancet 2025 review names chronic back pain and spinal stiffness as typical first symptoms.

What are the warning signs of ankylosing spondylitis?

JAMA 2025 describes inflammatory back pain (gradual onset before 45, prolonged morning stiffness, better with exercise, not better with rest) as the most common symptom. Separately, the NIAMS back pain page says to see a doctor if any of these happen with your back pain: numbness and tingling, severe back pain that does not improve with medication, back pain after a fall or injury, trouble urinating, weakness, pain or numbness in the legs, fever, and weight loss you did not intend. It also says to see a doctor if pain does not improve after a few weeks. If your pain changes suddenly, read when pain changes suddenly before your next appointment.

Does ankylosing spondylitis show up in blood work?

Blood tests can point toward axSpA, but they do not diagnose it alone. The JAMA 2025 review lists HLA-B27 positivity (a gene marker) with a sensitivity of 50% and a specificity of 90%. It lists an elevated C-reactive protein (a marker of inflammation) with a sensitivity of 35% and a specificity of 91%. In plain terms, about half of people with the condition test positive for HLA-B27, and about 90% of people without it test negative. Many people with HLA-B27 never develop the disease, so a positive result alone is not a diagnosis. The SAA article says C-reactive protein may be normal in nr-axSpA, so a normal blood test does not rule it out.

Imaging matters too. The JAMA review gives sacroiliitis on plain x-ray a sensitivity of 66% and a specificity of 68%, and on MRI a sensitivity of 78% and a specificity of 88%. The Lancet 2025 review says diagnosis relies on combining clinical, laboratory and imaging findings.

What are the bowel symptoms associated with ankylosing spondylitis?

The NIAMS ankylosing spondylitis page lists abdominal pain and loose bowel movements among the other symptoms that can occur. It also says people with Crohn’s disease or ulcerative colitis may be more likely to develop the disease. The JAMA 2025 review lists inflammatory bowel disease among the extra-skeletal features. If you have bowel symptoms along with back stiffness, say so at your visit, because the two are linked in these reviews.

What are the symptoms in females?

Women are about as likely as men to have nr-axSpA, with a male-to-female ratio of about 1:1, according to the SAA article and the Lancet 2017 review. Ankylosing spondylitis is more common in men. Ask your clinician whether the pattern above looks the same in women, since symptom differences by sex are worth raising at your visit. Because diagnosis is often delayed 6 to 8 years after symptoms start (JAMA 2025 review), keeping a simple record of your symptoms from the start helps. Note morning stiffness, night pain, activity and any eye, skin or bowel changes.

Non radiographic axial spondyloarthritis symptoms

The SAA article says the signs and symptoms of nr-axSpA are not different from those of ankylosing spondylitis. Typically, you have chronic low back pain that starts before about age 40 to 45, with inflammatory back pain that improves with activity and is not relieved by rest. Other features can include peripheral arthritis, iritis (eye inflammation), psoriasis, inflammatory bowel disease, and a family history of similar conditions. Fatigue, morning stiffness and tenderness are common too.

What gets mistaken for axial spondyloarthritis?

Back pain has many causes, and the NIAMS back pain page lists several that look similar: sprains and strains, degenerative disc disease, herniated discs, spondylolisthesis, spinal stenosis, fractured vertebrae, myofascial pain, fibromyalgia, osteoporosis-related fractures, kidney stones, endometriosis and infections of the spine. Osteoarthritis of the spine is one to ask about too. The NIAMS osteoarthritis page says its morning stiffness usually lasts less than 30 minutes, while the JAMA 2025 review describes prolonged morning stiffness in axSpA. Inflammatory arthritis such as seropositive rheumatoid arthritis can also cause joint pain and stiffness, which is one more reason the diagnosis needs a specialist’s look.

Is axial spondyloarthritis an autoimmune disease?

The 2025 JAMA review describes axSpA as an immune-mediated inflammatory condition. It says the disease may involve genetic predisposition, changes in gut bacteria, and injury at the points where tendons attach to bone. The NIAMS page says researchers do not know the exact cause, although genes and environment both appear to play a role, and HLA-B27 is the main gene known to raise risk. Whether the word “autoimmune” fits your case is a question for your rheumatologist.

Is non radiographic axial spondyloarthritis an autoimmune disease?

JAMA 2025 calls axSpA immune-mediated, and the SAA article places nr-axSpA and ankylosing spondylitis on the same spectrum. Ask your rheumatologist how that applies to you.

Is axial spondyloarthritis a disability?

The disease can affect how you function. The JAMA 2025 review says axSpA is associated with impaired physical function and reduced quality of life. The SAA article says that on average, loss of function and work impairment in nr-axSpA are comparable to ankylosing spondylitis. The NIAMS page also says that with treatment, most people with ankylosing spondylitis can have productive lives.

Whether it counts as a disability depends on the program, law or employer rule you are asking about, such as a benefits program, a workplace accommodation or an insurance policy. Each has its own definition and process, and this page does not set those rules out. This is general information, not legal advice. For a decision, ask the program directly, or speak with a benefits adviser or employment lawyer. Your rheumatology records of diagnosis, symptoms and treatment are the starting point for most of those conversations.

Treatment options for axial spondyloarthritis, side by side

Treatment is chosen with a clinician, based on how active your disease is and what else you have. The 2025 JAMA review says physical therapy and NSAIDs are first-line. It also says fewer than 25% of patients achieve complete symptom control with NSAIDs, and that about 75% need biologic drugs or targeted synthetic drugs (JAK inhibitors) to reduce symptoms, prevent structural damage and improve quality of life. Physical therapy is a core part of the plan, and the NIAMS page says exercise and physical or occupational therapy can improve mobility and posture. The table below sets out the drug options named in the reviews.

Ask your clinician’s office or your insurer what each option would cost you before you choose.

What can you do between visits?

Movement is one of the most useful steps you control. The NIAMS page says moving and exercise usually help pain, and that pain often worsens with rest or inactivity. The Lancet 2025 review lists education, smoking cessation, exercise and physiotherapy as non-drug management. For low back pain in general, the National Center for Complementary and Integrative Health (NCCIH) summarizes studies of tai chi, yoga, acupuncture and mindfulness-based stress reduction, and reports that a clinical practice guideline encourages non-drug approaches as the first step. Discuss any of these with your clinician, since your own plan should fit your diagnosis.

Supplements and products sold for arthritis or pain

NCCIH says “natural” does not always mean safe, that some supplements can have side effects or interact with medicines, and that the FDA has warned the public about several supplements promoted for arthritis or pain that were tainted with prescription drugs (NCCIH chronic pain fact sheet). Before you consider any product, bring its label to your visit, along with your medicine list (your medication list for a pain-care visit).

What is still not known?

• The cause. The NIAMS page says researchers do not know what causes the disease.
• Which option will work for you. The trial percentages are averages across groups of people, not predictions for one person.
• Whether nr-axSpA will move on to ankylosing spondylitis. The SAA article says it is hard to predict for an individual.

Questions to take to your visit

• Could my back pain and stiffness be inflammatory, and which tests would you order to check?
• Would a sacroiliac joint MRI or x-ray help us decide?
• Is my pattern more like axial spondyloarthritis, osteoarthritis or a mechanical problem?
• What is my current disease activity, and how will we track it?
• Which first step fits me: physical therapy, NSAIDs, or something else?
• If the first step does not control my symptoms, what comes next?
• Do my bowel, eye or skin symptoms need separate checks?
• What would each option cost me, and what should I watch for?
• Could my records support a work or benefits request, and which forms do you complete?

A simple way to open the conversation is: “I have chronic back pain that started before 45, with morning stiffness that lasts a long time and eases when I move. I want to know whether an inflammatory cause has been ruled in or out.”

Keep a short log for two to four weeks: minutes of morning stiffness, night pain, activity level, and any flares. Note how each flare differs from your usual pattern, using the questions in pain flare. Bring the log, your medicine list and your questions. For weighing each option with your clinician, shared decision-making in pain care offers a useful set of questions.

By the Pain Care Questions Team

This article is for general information purposes only and does not constitute medical advice. Consult your doctor or qualified healthcare provider before making changes to your health routine.