Ankylosing Spondylitis

Overview

Ankylosing spondylitis is a long-term inflammatory condition that mainly affects the spine and the joints between the spine and pelvis, known as the sacroiliac joints. It belongs to a group of conditions called spondyloarthritis. The inflammation can cause back pain and stiffness, especially in the lower back and hips. Over time, some people may develop reduced flexibility in the spine.

Ankylosing spondylitis often begins in young adulthood, but symptoms can appear at different ages. The condition can vary widely from person to person. Some people have mild symptoms that come and go, while others experience more persistent discomfort and limitations in movement. With appropriate medical care, many people can manage symptoms, maintain mobility, and continue daily activities.

Symptoms

The symptoms of ankylosing spondylitis usually develop gradually. They may be mistaken for common back strain at first, but inflammatory back pain has some typical features.

• Lower back or buttock pain that lasts for several weeks or longer
• Stiffness in the back or hips, especially in the morning or after rest
• Improvement of stiffness with movement or gentle activity
• Pain that may wake a person during the second half of the night
• Reduced flexibility of the spine over time
• Neck, shoulder, rib, or chest wall discomfort in some cases
• Pain or swelling in other joints, such as the hips, knees, or ankles
• Tenderness where tendons or ligaments attach to bone, often around the heel
• Fatigue related to ongoing inflammation

Some people may also develop inflammation outside the joints, such as eye inflammation causing redness, pain, or sensitivity to light. Less commonly, other organs may be involved. Any new or unusual symptoms should be discussed with a healthcare professional.

Causes and Risk Factors

The exact cause of ankylosing spondylitis is not fully understood. It is considered an immune-mediated inflammatory condition, meaning the body’s immune system plays a role in causing inflammation in the joints and surrounding tissues.

Several factors may increase the likelihood of developing the condition:

• Family history of ankylosing spondylitis or related inflammatory conditions
• Genetic background, including certain inherited markers that may be associated with higher risk
• Young adult age at symptom onset, although symptoms can begin earlier or later
• History of other spondyloarthritis-related conditions, such as inflammatory bowel disease or certain types of skin or eye inflammation

Having a risk factor does not mean a person will definitely develop ankylosing spondylitis. Similarly, some people with the condition may not have a known family history. A rheumatologist can evaluate symptoms, medical history, and test results to help clarify the cause of ongoing inflammatory pain.

Diagnosis

Diagnosing ankylosing spondylitis may take time because early symptoms can resemble other causes of back pain. Evaluation usually begins with a detailed discussion of symptoms, including when pain started, how long stiffness lasts, and whether movement improves symptoms. The doctor may also ask about family history, eye problems, bowel symptoms, skin changes, and joint swelling.

A physical examination may include checking posture, spinal movement, hip movement, and areas of tenderness. Blood tests may be used to look for signs of inflammation and certain genetic markers. These tests do not confirm the diagnosis on their own, but they can provide useful information when considered with symptoms and examination findings.

Imaging tests may also be recommended. X-rays can show changes in the sacroiliac joints or spine if the condition has been present for some time. Magnetic resonance imaging may detect active inflammation earlier than X-rays in some patients. The choice of tests depends on the individual situation and the healthcare provider’s assessment.

Treatment Options

Treatment for ankylosing spondylitis aims to reduce pain and stiffness, control inflammation, maintain posture and flexibility, and support quality of life. The treatment plan is individualized and may change over time depending on symptoms, disease activity, and response to care.

Physical activity and guided exercise are important parts of management. A physiotherapist may recommend exercises to support spinal flexibility, posture, breathing expansion, and general strength. Regular movement can help reduce stiffness and maintain function. Exercise plans should be adapted to the person’s abilities and overall health.

Medications may be used to control pain and inflammation. In some cases, treatments that target specific parts of the immune response may be considered by a rheumatologist. The choice of medication depends on symptom severity, associated conditions, medical history, and monitoring needs. Patients should not start, stop, or change medicines without medical advice.

Supportive measures may include posture awareness, ergonomic adjustments, safe activity planning, and attention to sleep and fatigue. If other joints, eyes, skin, or the digestive system are involved, care may include collaboration with other specialists. Surgery is rarely needed, but it may be considered in selected cases with severe joint damage or significant structural problems.

When to See a Doctor

A medical evaluation is recommended if back pain or stiffness lasts for several weeks, begins gradually, is worse after rest, improves with movement, or regularly wakes a person at night. These features may suggest inflammatory back pain and should be assessed by a healthcare professional.

Seek prompt medical attention if there is sudden eye redness with pain or light sensitivity, unexplained joint swelling, new weakness or numbness, loss of bladder or bowel control, fever, unexplained weight loss, or severe pain after an injury. These symptoms may require urgent evaluation.

People with a family history of ankylosing spondylitis or related inflammatory conditions should also consider medical advice if they develop persistent back, hip, or joint symptoms. Early assessment by a rheumatology specialist can help guide appropriate monitoring and management.