Ankylosing Spondylitis (AS)

Medically reviewed by John Sammis, D.O. on April 2, 2024
An elderly man with gray hair leans forward, clutching his lower back with one hand, while wearing a light pink button-up shirt. His expression appears strained.
15 min read

Ankylosing Spondylitis (AS) is a chronic inflammatory disease that primarily affects the spine and sacroiliac joints, causing pain and stiffness. Over time, it can lead to a fusion of the spine, significantly impacting posture and mobility. This condition is part of a group of arthritis-related diseases known as spondyloarthropathies. AS is characterized by the body's immune system mistakenly attacking healthy joints, leading to inflammation and discomfort.

Take the Ankylosing Spondylitis (AS) Assessment

Prevalence of Ankylosing Spondylitis

AS is a relatively rare condition, affecting approximately 0.1% to 0.5% of the adult population worldwide. It is more commonly diagnosed in men than in women and typically begins in early adulthood. The exact number of cases may be higher due to undiagnosed or misdiagnosed instances. Early detection and treatment are crucial for managing symptoms and preventing severe complications.

Outlook for AS Patients

The outlook for individuals with Ankylosing Spondylitis varies. While some may experience only mild symptoms, others may face significant challenges due to the progressive nature of the disease. With modern treatments, including biologic medications and physical therapy, many patients can manage their symptoms effectively and maintain a good quality of life. Regular exercise and a healthy lifestyle also play a critical role in managing AS.

Causes and Risk Factors of AS

The exact cause of Ankylosing Spondylitis is unknown, but genetic factors are believed to play a significant role. The presence of the HLA-B27 gene is strongly associated with AS, although not everyone with this gene will develop the condition. Other risk factors include a family history of AS and certain environmental triggers that may initiate the inflammatory process in genetically susceptible individuals.

Diagnosing Ankylosing Spondylitis

Diagnosing AS can be challenging due to its gradual onset and nonspecific early symptoms. A combination of medical history, physical examinations, imaging tests such as X-rays or MRI, and blood tests for inflammatory markers and the HLA-B27 gene are typically used to confirm a diagnosis. Early recognition of the signs and symptoms of AS is essential for starting treatment and reducing the risk of severe spinal damage.

Symptoms

Ankylosing Spondylitis often begins with pain and stiffness in the lower back and hips, especially noticeable in the morning or after periods of inactivity. Chronic inflammation can also cause a feeling of tiredness and fatigue. Recognizing these early signs is crucial for timely diagnosis and management.

Common Symptoms of AS

The primary symptoms of Ankylosing Spondylitis revolve around progressive pain and immobility, which can vary in intensity and duration. Here is a list of the most common symptoms:

  • Persistent pain in the lower back and buttocks
  • Stiffness in the spine, particularly in the morning
  • Neck pain and reduced flexibility
  • Enthesitis, or pain and tenderness at the site where tendons and ligaments attach to bones
  • Fatigue due to chronic inflammation

Advanced Symptoms of AS

As Ankylosing Spondylitis progresses, symptoms may become more severe. Advanced symptoms include chronic pain that doesn't subside with rest, ankylosis (fusion of the spine), which can lead to a stooped posture, and difficulty breathing if the ribs are affected. Eye inflammation, known as uveitis, can also occur, causing pain, sensitivity to light, and blurred vision.

Systemic Symptoms of AS

Aside from the musculoskeletal system, Ankylosing Spondylitis can manifest systemically. Patients may experience fever, weight loss, and fatigue. In some cases, the heart and lungs can be involved, leading to symptoms such as shortness of breath and heart palpitations.

Impact on Quality of Life

The symptoms of Ankylosing Spondylitis can significantly impact daily activities and quality of life. Chronic pain and stiffness can limit physical function, while fatigue can affect emotional and mental well-being. It's important for individuals experiencing these symptoms to seek medical advice for proper assessment and management.

Causes

One of the primary causes of Ankylosing Spondylitis (AS) is believed to be genetic predisposition. The presence of the HLA-B27 gene is significantly associated with the condition, although not everyone with this gene will develop AS. Family history plays a crucial role, and the risk is higher if a close family member has the disease. However, genetics alone does not fully explain the onset of AS, indicating that other factors contribute to its development.

Could Environmental Triggers Influence AS Development?

Environmental factors are also thought to contribute to the onset of Ankylosing Spondylitis. Although the specific environmental triggers are not fully understood, researchers suggest that certain infections could initiate an immune response in individuals genetically predisposed to AS. This hypothesis is supported by the fact that AS symptoms often appear following gastrointestinal or genitourinary infections, hinting at a possible link between microbial agents and the immune system's role in the disease.

How Does the Immune System Contribute to AS?

The immune system's involvement is a key aspect in the development of Ankylosing Spondylitis. An autoimmune response, where the body's immune system mistakenly attacks its own tissues, is thought to play a central role. This can lead to chronic inflammation, particularly in the joints of the spine and pelvis, although the exact trigger for this autoimmune reaction remains elusive. Understanding the immune system's contribution to AS is crucial for developing targeted treatments.

Are There Hormonal Influences on Ankylosing Spondylitis?

While less commonly discussed, hormonal factors may influence the development and progression of Ankylosing Spondylitis. The condition is more prevalent in men than in women, suggesting that sex hormones could play a role. Additionally, some studies have indicated that the onset and severity of AS symptoms can vary with hormonal changes, although more research is needed to clarify these potential connections and their implications for managing AS.

Does Lifestyle Impact the Risk of Developing AS?

Lifestyle factors, such as smoking and physical inactivity, have been associated with an increased risk of developing Ankylosing Spondylitis. Smoking, in particular, not only increases the risk but can also exacerbate the severity of the disease. It is believed that smoking may trigger an inflammatory response in genetically susceptible individuals. Conversely, regular exercise and maintaining a healthy weight may help manage symptoms and potentially reduce the risk of AS progression.

Getting a Diagnosis

When suspecting Ankylosing Spondylitis, healthcare providers begin with a detailed medical history and physical examination. They look for symptoms such as chronic back pain and stiffness that improve with exercise but not with rest. A family history of AS or related conditions may also be indicative. The assessment may include evaluating the range of motion in the spine and the presence of pain at specific points on the pelvis.

How Are Imaging Tests Utilized in AS Diagnosis?

Imaging tests play a crucial role in diagnosing Ankylosing Spondylitis. X-rays of the spine and pelvis can reveal characteristic changes, including fusion of the sacroiliac joints. MRI scans are more sensitive and can detect inflammation and structural changes in the joints and spine at an earlier stage than X-rays, which is particularly helpful in early diagnosis and assessing the extent of disease progression.

Can Blood Tests Confirm Ankylosing Spondylitis?

Blood tests are used to support the diagnosis of Ankylosing Spondylitis. They may include the HLA-B27 genetic marker test, which is found in many people with AS. However, not everyone with this gene develops the condition. Inflammatory markers such as C-reactive protein (CRP) and erythrocyte sedimentation rate (ESR) can also be elevated in AS, indicating the presence of inflammation in the body.

What is the Role of Patient History in Diagnosing AS?

A comprehensive patient history is vital for diagnosing Ankylosing Spondylitis. It includes the duration and characteristics of symptoms, such as inflammatory back pain, which typically lasts for more than three months and is associated with morning stiffness. The history may also reveal the effectiveness of nonsteroidal anti-inflammatory drugs (NSAIDs) in relieving symptoms, which is another clue supporting an AS diagnosis.

Are There Other Diagnostic Tools for AS?

While imaging and blood tests are primary tools, other diagnostic methods may include a physical maneuver known as the Schober's test to measure the flexibility of the spine. Additionally, response to certain medications can be indicative of Ankylosing Spondylitis. In some cases, a multidisciplinary approach involving rheumatologists, ophthalmologists, and gastroenterologists may be necessary to diagnose related conditions and complications.

Questions for Your Doctor

When first diagnosed with Ankylosing Spondylitis, it's crucial to understand the specifics of your condition. Discuss the criteria used for your diagnosis, including genetic markers like HLA-B27, and the implications for disease progression. Inquire about the typical symptoms and how they may evolve over time. Understanding the nature of AS is the first step in managing your health effectively.

Personalized Treatment Options for AS

Every individual's experience with AS is unique, making personalized treatment plans essential. Ask your doctor about the range of treatment options available, including medications like NSAIDs, TNF inhibitors, and newer biologic agents. Explore the benefits and potential side effects of each treatment, and how they fit into your lifestyle. Discuss the role of physical therapy and exercise in managing symptoms and maintaining mobility.

Monitoring Disease Activity and Flare-ups

Regular monitoring of AS is vital for effective management. Discuss with your doctor the signs of increased disease activity and how to recognize a flare-up. Learn about the tools and tests, such as CRP levels and MRI, used to monitor inflammation and disease progression. Understanding these aspects can help you and your doctor make timely adjustments to your treatment plan.

Lifestyle Adjustments and Home Management Strategies

Lifestyle changes can significantly impact the management of AS. Discuss with your doctor strategies for home management of AS symptoms, including exercise routines, posture correction, and ergonomic adjustments at work or home. Inquire about dietary considerations and whether supplements or alternative therapies could be beneficial. It's also important to understand how to balance activity with rest to prevent overexertion.

Long-term Prognosis and Health Maintenance

Understanding the long-term outlook of living with AS is essential for future planning. Discuss with your doctor the potential complications, such as uveitis or cardiovascular issues, and how regular check-ups can help prevent them. Inquire about the likelihood of needing surgery in the future and the factors that may influence your long-term prognosis. Knowing what to expect can help you make informed decisions about your health and lifestyle.

Treatment

Effective management of Ankylosing Spondylitis often begins with medications. Nonsteroidal anti-inflammatory drugs (NSAIDs) are commonly prescribed to reduce inflammation and relieve pain. For more severe cases, disease-modifying antirheumatic drugs (DMARDs) like sulfasalazine or methotrexate may be recommended. Biologic agents, particularly TNF inhibitors, have also shown significant promise in reducing AS symptoms and slowing disease progression.

Physical Therapy and Exercise

Regular physical therapy and exercise are crucial in maintaining flexibility and improving posture for individuals with AS. A tailored exercise regimen can help manage pain, maintain mobility, and prevent spinal deformity. Engaging in activities such as swimming, which is gentle on the joints, or specific stretching and strengthening exercises, can be particularly beneficial for those living with Ankylosing Spondylitis.

Advanced Treatment: Surgery

In advanced cases of Ankylosing Spondylitis where severe joint damage or deformity occurs, surgery may be considered. The most common procedures are joint replacement, particularly of the hips, and in rare cases, spinal surgery to correct severe curvature. Surgical intervention is typically reserved for when conservative treatments have failed to provide adequate relief or improve function.

Lifestyle Modifications and Support

Adopting certain lifestyle changes can significantly impact the management of AS symptoms. This includes maintaining a healthy weight, quitting smoking, and practicing good posture. Additionally, joining support groups or seeking counseling can help individuals cope with the emotional challenges of living with a chronic condition like Ankylosing Spondylitis.

Alternative and Complementary Therapies

Some patients with AS find relief through alternative therapies such as acupuncture, massage, or chiropractic treatments. While these methods should not replace conventional treatments, they may provide additional symptom relief when used in conjunction with medical therapies. It's important to consult with a healthcare provider before starting any alternative treatments to ensure they are safe and appropriate for your specific condition.

Drugs & Medications

The cornerstone of pharmacological management for Ankylosing Spondylitis (AS) includes nonsteroidal anti-inflammatory drugs (NSAIDs). These medications, such as ibuprofen and naproxen, help reduce inflammation and pain. For patients who do not respond adequately to NSAIDs, tumor necrosis factor (TNF) inhibitors may be prescribed, which include drugs like infliximab, etanercept, and adalimumab. These biologic medications can significantly reduce disease activity and improve quality of life.

Are There Advanced Treatments for Severe AS Symptoms?

For more severe cases of AS, where TNF inhibitors are not effective or suitable, interleukin-17 (IL-17) inhibitors such as secukinumab and ixekizumab may be used. These drugs target specific pathways in the immune system to reduce inflammation. Janus kinase (JAK) inhibitors, like tofacitinib, represent another class of medication that has shown promise in treating AS by interfering with inflammatory signaling pathways.

How Are Pain and Stiffness Managed in AS?

Chronic pain and stiffness in AS may be managed with the use of analgesics such as acetaminophen. In addition, muscle relaxants can be prescribed to alleviate muscle spasms. However, these treatments do not slow disease progression and are often used in combination with anti-inflammatory or biologic drugs that target the underlying disease mechanisms.

What Role Do Corticosteroids Play in AS Treatment?

Corticosteroids, such as prednisone, can be used for short-term relief of inflammation in AS. They may be administered orally or through direct injection into affected joints or areas. Due to potential long-term side effects, corticosteroids are generally not recommended for chronic use in the management of Ankylosing Spondylitis.

Are There Any Other Medications Prescribed for AS?

In some cases, disease-modifying antirheumatic drugs (DMARDs) like sulfasalazine and methotrexate may be prescribed, particularly when peripheral joints are affected. However, these drugs are not typically the first line of treatment for spinal symptoms associated with AS. Ongoing research continues to explore new therapeutic options that can provide relief and improve outcomes for patients with Ankylosing Spondylitis.

Diet

For individuals managing Ankylosing Spondylitis, a diet rich in omega-3 fatty acids can be beneficial. Foods such as fatty fish, chia seeds, and walnuts help reduce inflammation. Additionally, incorporating fruits and vegetables high in antioxidants can support overall health. A balanced diet with lean proteins, whole grains, and calcium-rich foods is also recommended to maintain strong bones and muscle function.

Are There Foods to Avoid with Ankylosing Spondylitis?

While there's no one-size-fits-all diet for AS, certain foods may exacerbate symptoms. It's advisable to limit sugar, refined carbs, and saturated fats, as they can contribute to inflammation. Additionally, some individuals may benefit from reducing starch-intensive foods. Keeping a food diary can help identify personal triggers and tailor a diet that works best for you.

Can a Gluten-Free Diet Help with AS Symptoms?

Though research is ongoing, some people with Ankylosing Spondylitis report symptom relief after adopting a gluten-free diet. If you suspect gluten sensitivity, it's important to consult with a healthcare professional before making significant dietary changes. They can guide you through the process and ensure you're still receiving all necessary nutrients.

How Important is Hydration for AS Management?

Staying hydrated is crucial for everyone, but it's especially important for those with AS. Water helps maintain joint lubrication and flexibility, which can be beneficial for mobility. Aim for at least eight glasses of water daily and consider incorporating hydrating foods like cucumbers and melons into your diet.

Should You Consider Dietary Supplements for Ankylosing Spondylitis?

Supplements may be a valuable addition to your diet, particularly if you have dietary restrictions or deficiencies. Vitamin D and calcium supplements can support bone health, while omega-3 supplements may help manage inflammation. Always discuss with your healthcare provider before starting any new supplements to ensure they're appropriate for your specific health needs and won't interact with your AS medications.

Lifestyle

Regular physical activity is crucial for managing Ankylosing Spondylitis. Low-impact exercises such as swimming, walking, or yoga can help maintain flexibility and posture. It's important to tailor your exercise routine to your comfort level and to avoid high-impact activities that may exacerbate symptoms.

Maintain a Healthy Weight

Keeping your weight in check is beneficial for those with Ankylosing Spondylitis. Excess weight can put additional strain on your joints, particularly the spine and hips. A balanced diet rich in anti-inflammatory foods can also help manage inflammation and pain associated with AS.

Practice Good Posture

Proper posture is essential for individuals with Ankylosing Spondylitis. Simple adjustments to your daily routine, such as using ergonomic furniture and being mindful of your posture while standing and sitting, can make a significant difference. Regularly practicing posture exercises can also be beneficial.

Manage Stress Effectively

Stress can trigger and worsen Ankylosing Spondylitis symptoms. Techniques such as deep breathing, meditation, or mindfulness can help reduce stress levels. It's also helpful to engage in hobbies or activities that you find relaxing and enjoyable.

Quit Smoking

Smoking has been shown to exacerbate Ankylosing Spondylitis symptoms and can accelerate the progression of the disease. Quitting smoking is one of the most impactful lifestyle changes you can make to improve your overall health and manage AS symptoms more effectively.