Ankylosing Spondylitis

What is ankylosing spondylitis?

Ankylosing spondylitis is a long-term (chronic) form of inflammatory arthritis that mainly affects the spine and the sacroiliac joints, which are the joints connecting the base of the spine to the pelvis. The word “ankylosing” refers to stiffening or fusing, and “spondylitis” means inflammation of the vertebrae, the bones of the spine. In this condition, ongoing inflammation causes pain and stiffness, and over many years it can lead to new bone formation. In some people, this extra bone gradually joins vertebrae together, reducing flexibility of the back. In advanced cases, sections of the spine may fuse into a fixed position.

Ankylosing spondylitis belongs to a wider group of conditions called spondyloarthritis, which are inflammatory diseases that affect the spine and sometimes other joints, tendons, eyes, skin, and bowel. It is not the same as ordinary “wear and tear” back pain (osteoarthritis) or a slipped disc, because the underlying problem is inflammation driven by the immune system rather than mechanical damage alone.

The condition most often begins in late adolescence or early adulthood, typically before the age of 45, and frequently in the twenties. It affects men more often than women, although women can develop it as well and their symptoms are sometimes recognized later because they may present differently. Ankylosing spondylitis is a lifelong condition, but with modern care many people manage their symptoms well and continue to work, exercise, and live active lives.

Symptoms of ankylosing spondylitis

Ankylosing spondylitis symptoms usually develop gradually over weeks or months rather than suddenly. The most characteristic feature is inflammatory back pain, which behaves differently from mechanical back pain: it tends to improve with movement and exercise, worsens with rest, and is often most noticeable at night or early in the morning.

Common symptoms include:

• Chronic lower back and buttock pain that has lasted more than three months, often starting before age 45.
• Morning stiffness in the back that typically lasts 30 minutes or longer and eases with activity.
• Pain that wakes you at night, particularly in the second half of the night.
• Alternating buttock pain, switching from one side to the other, caused by inflammation of the sacroiliac joints.
• Fatigue, which is common because ongoing inflammation drains energy and disturbs sleep.
• Pain and swelling in other joints, such as the hips, shoulders, knees, or heels.
• Enthesitis, meaning inflammation where tendons and ligaments attach to bone, often felt at the heel (Achilles tendon) or under the foot.
• Chest tightness or pain when the joints between the ribs and spine are affected, which can make deep breathing uncomfortable.
• Eye inflammation (uveitis), causing a painful, red eye, blurred vision, and sensitivity to light. This affects a significant number of people with ankylosing spondylitis at some point.

Symptoms often vary over time, with periods of worsening, called flares, followed by quieter phases. In the early stage of the disease, pain and stiffness in the lower back and pelvis are usually the main problems. As the condition progresses in some people, inflammation and new bone formation can reduce spinal flexibility, and posture may change, sometimes producing a stooped, forward-bent position. Not everyone reaches this advanced stage; the course of the disease differs widely from person to person, and many people never develop significant spinal fusion.

Some people with spondyloarthritis also have related conditions such as psoriasis (a scaly skin condition) or inflammatory bowel disease (chronic inflammation of the digestive tract, such as Crohn’s disease or ulcerative colitis). If you have one of these conditions along with persistent back pain, it is worth mentioning both to your doctor.

Causes and risk factors

The exact ankylosing spondylitis causes are not fully understood. It is considered an immune-mediated disease, meaning the body’s immune system contributes to inflammation in the joints and entheses (the attachment points of tendons and ligaments). It is not caused by injury, posture, or lifting, although these can aggravate existing symptoms.

Several factors are known to increase the risk:

• Genetics. The strongest known risk factor is a gene called HLA-B27. Most people with ankylosing spondylitis carry this gene. However, carrying HLA-B27 does not mean you will develop the disease: many healthy people have the gene and never become ill. Other genes also appear to play a role.
• Family history. Having a close relative with ankylosing spondylitis or another form of spondyloarthritis increases the likelihood of developing it.
• Age. Symptoms usually begin in the late teens to early forties. Onset after age 45 is less typical.
• Sex. The condition is diagnosed more often in men, though women are also affected and may be underdiagnosed.
• Related inflammatory conditions. Psoriasis, inflammatory bowel disease, and previous episodes of uveitis are associated with spondyloarthritis.

Environmental factors, possibly including certain infections or changes in gut bacteria, are being studied as potential triggers in genetically susceptible people, but no single cause has been proven. Smoking does not cause ankylosing spondylitis, but it is associated with worse disease outcomes and poorer response to treatment, which is one of several reasons doctors strongly advise people with the condition not to smoke.

Diagnosis

There is no single test that proves someone has ankylosing spondylitis. Instead, doctors combine your medical history, a physical examination, blood tests, and imaging to reach a diagnosis. Because early symptoms overlap with common mechanical back pain, ankylosing spondylitis diagnosis is often delayed by several years, which is why persistent inflammatory-type back pain in a young adult deserves specialist attention.

The assessment usually includes:

• Medical history. Your doctor will ask how long the pain has lasted, whether it improves with exercise and worsens with rest, whether it wakes you at night, how long morning stiffness lasts, and whether you or family members have related conditions such as psoriasis, uveitis, or inflammatory bowel disease.
• Physical examination. This checks the flexibility of your spine, chest expansion during breathing, tenderness over the sacroiliac joints, and inflammation in other joints or tendon attachments.
• Blood tests. Tests for inflammation markers, such as C-reactive protein (CRP) and erythrocyte sedimentation rate (ESR), are often raised during active disease, though they can be normal. A test for the HLA-B27 gene may support the diagnosis, but on its own it neither confirms nor rules out the disease.
• X-rays. Plain X-rays of the pelvis can show established damage in the sacroiliac joints (sacroiliitis) and changes in the spine. However, X-ray changes may take years to appear, so normal X-rays do not exclude early disease.
• Magnetic resonance imaging (MRI). MRI can detect active inflammation in the sacroiliac joints and spine before permanent damage is visible on X-ray, making it especially valuable for earlier diagnosis.

Rheumatologists, doctors who specialize in inflammatory joint and autoimmune diseases, use internationally recognized classification criteria that combine these clinical, laboratory, and imaging findings. When imaging shows clear structural damage, the condition is often called radiographic axial spondyloarthritis, which corresponds to classic ankylosing spondylitis; when inflammation is present without X-ray damage, it may be called non-radiographic axial spondyloarthritis. Both forms are managed in similar ways.

Treatment options for ankylosing spondylitis

There is currently no cure for ankylosing spondylitis, but effective treatment can relieve pain and stiffness, control inflammation, help preserve posture and mobility, and in many cases slow the impact of the disease on daily life. Ankylosing spondylitis treatment is usually coordinated by a rheumatologist and tailored to how active the disease is and which parts of the body are affected. Within hospital settings such as Acibadem, this condition is typically managed by the rheumatology department, often working together with physical therapists, eye specialists, and pain specialists when needed. A general overview of care for this condition is also available on the ankylosing spondylitis treatment page.

Exercise and physical therapy

Regular exercise is a cornerstone of treatment, not an optional extra. Stretching, posture training, strengthening of the back and core muscles, and aerobic activity help maintain spinal flexibility and reduce stiffness. A physical therapist can design a program suited to your condition and teach exercises to perform at home. Swimming and other low-impact activities are often well tolerated. Staying active also supports mood, sleep, and general health.

Medications

• Nonsteroidal anti-inflammatory drugs (NSAIDs). Medicines such as ibuprofen or naproxen are usually the first-line drug treatment. They reduce pain and stiffness in many people. Because long-term use can affect the stomach, kidneys, and cardiovascular system, they should be used under medical supervision.
• Biologic medicines. If NSAIDs and exercise do not control the disease, doctors may recommend biologic drugs, which are targeted medicines that block specific inflammatory signals. The main groups used in ankylosing spondylitis are TNF inhibitors and IL-17 inhibitors. These can substantially reduce inflammation and symptoms in many patients, though they slightly increase the risk of infections and require monitoring.
• Targeted synthetic drugs. Janus kinase (JAK) inhibitors, taken as tablets, are a newer option that may be considered in selected patients when other treatments are unsuitable or ineffective.
• Conventional disease-modifying drugs. Medicines such as sulfasalazine are generally not effective for spinal symptoms but may help when peripheral joints, such as the knees, are inflamed.
• Corticosteroids. Steroid injections into an inflamed joint or tendon area can provide temporary relief. Long-term oral steroids are usually avoided in this condition.

Procedures for pain control

When specific joints or structures remain painful despite medication, targeted procedures such as image-guided injections may be considered as part of interventional pain management. These procedures do not change the underlying disease but can reduce pain in a specific area and make exercise and daily activities easier. Your doctor can explain whether such an approach is appropriate in your situation.

Surgery

Most people with ankylosing spondylitis never need surgery. It may be considered in specific circumstances, for example hip replacement when the hip joint is severely damaged, or corrective spinal surgery in rare cases of severe deformity or spinal instability. Because a fused spine is more vulnerable to fracture, any significant new pain after even a minor injury should be assessed promptly.

Watchful monitoring and lifestyle measures

In very mild disease, doctors may sometimes recommend regular monitoring, exercise, and as-needed anti-inflammatory medication rather than continuous drug treatment. Whatever the treatment plan, stopping smoking, maintaining a healthy weight, protecting bone health, and attending regular follow-up visits are important parts of long-term care.

Living with ankylosing spondylitis and outlook

Ankylosing spondylitis is a lifelong condition, but its course varies enormously. Some people have mild, intermittent symptoms for decades, while others experience more persistent disease that affects posture and mobility. With earlier diagnosis and modern medications, many people today keep the disease well controlled and remain active in work, family life, and sport. It is not possible to predict the exact course for any individual, and no treatment can guarantee that the disease will not progress, but consistent treatment and regular exercise are associated with better outcomes in many cases.

Practical steps that often help include building daily movement and stretching into your routine, adjusting your workstation to support good posture, choosing a supportive mattress, pacing activities during flares, and learning strategies to manage fatigue. Because chronic pain and fatigue can affect mood, it is reasonable to discuss emotional wellbeing with your care team; support for anxiety or low mood is part of good long-term care. Regular follow-up allows your doctor to monitor disease activity, screen for complications such as osteoporosis (weakened bones) or eye inflammation, and adjust treatment when needed.

Frequently asked questions

What is ankylosing spondylitis in simple terms?

It is a chronic inflammatory arthritis of the spine and pelvis. The immune system causes inflammation in the joints of the back, leading to pain and stiffness, and over time some people develop extra bone that can stiffen or fuse parts of the spine. It usually starts in young adulthood and is different from ordinary mechanical back pain because it improves with movement and worsens with rest.

Can ankylosing spondylitis be cured or heal on its own?

There is currently no cure, and the condition does not usually disappear on its own, although symptoms can fluctuate and some people experience long quiet periods. Treatment aims to control inflammation, relieve pain, and protect mobility. Many people achieve good, lasting symptom control with a combination of exercise and medication, but ongoing management is generally needed.

How serious is ankylosing spondylitis?

The severity varies widely. Many people have manageable symptoms and lead full, active lives, while a smaller proportion develop significant spinal stiffness or complications affecting the eyes, hips, or, rarely, the heart and lungs. Early diagnosis, appropriate treatment, regular exercise, and not smoking are all associated with better outcomes, though the course cannot be predicted with certainty for any individual.

How do doctors confirm an ankylosing spondylitis diagnosis?

Doctors combine your symptom history, a physical examination, blood tests for inflammation and the HLA-B27 gene, and imaging. MRI can show early inflammation in the sacroiliac joints before damage appears on X-ray, while X-rays can confirm established changes. No single test is decisive on its own, so a rheumatologist weighs all the findings together using recognized criteria.

What is the best treatment for ankylosing spondylitis?

There is no single best treatment for everyone. Regular exercise and physical therapy are recommended for nearly all patients, and NSAIDs are usually the first medication tried. If the disease remains active, biologic medicines or JAK inhibitors may be recommended. The right combination depends on your disease activity, other health conditions, and preferences, and is best decided together with your rheumatologist.

Is ankylosing spondylitis hereditary?

Genetics play an important role, particularly the HLA-B27 gene, and the condition can run in families. However, inheritance is not straightforward: most people who carry HLA-B27 never develop the disease, and having an affected parent does not mean a child will definitely develop it. If a family member has persistent inflammatory-type back pain, early medical assessment is sensible.

Can I exercise and work with ankylosing spondylitis?

In most cases, yes. Exercise is actually a key part of treatment, and staying physically active often reduces stiffness and pain. Many people continue in their usual jobs, sometimes with adjustments such as more frequent posture breaks or ergonomic changes. High-impact contact sports may need caution, especially if the spine has become stiff, so it is wise to discuss specific activities with your care team.

When to see a doctor

See a doctor if you have back pain that has lasted more than three months, began before age 45, improves with activity, worsens with rest, or regularly wakes you at night, especially if it is accompanied by prolonged morning stiffness, heel pain, joint swelling, psoriasis, inflammatory bowel disease, or a family history of spondyloarthritis. Early assessment by a specialist can shorten the delay to diagnosis and treatment.

Seek urgent medical attention if you experience any of the following red-flag warning signs:

• A painful, red eye with blurred vision or light sensitivity, which may indicate uveitis and needs prompt eye treatment to protect vision.
• Sudden new or severe back or neck pain after a fall or even a minor injury, because a stiffened spine is more prone to fracture.
• Numbness or weakness in the legs, loss of bladder or bowel control, or numbness around the groin, which can signal pressure on the spinal nerves and is a medical emergency.
• Chest pain, severe shortness of breath, or palpitations, which always require urgent evaluation.
• Fever with worsening back pain, which may point to infection rather than a routine flare.
• Signs of infection while taking biologic or other immune-suppressing medicines, such as persistent fever, cough, or an unexplained feeling of being seriously unwell.

If you are already under specialist care and your symptoms change significantly, your medications stop working, or you develop side effects, contact your treating team rather than adjusting or stopping treatment on your own.