What is ankylosing spondylitis?
Ankylosing spondylitis (AS) is a type of arthritis primarily affecting the spine, although other joints and areas around the body can also be involved, including complications like inflammatory bowel disease. It's characterized by inflammation that can lead to the fusion of vertebrae, resulting in reduced flexibility and potentially a hunched-forward posture. The disease is more common in men than women and typically begins in early adulthood.
Risk factors
- Genetic predisposition: Most people with AS have the HLA-B27 gene, although having the gene does not guarantee that one will develop ankylosing spondylitis.
- Family history: Having a family member with AS increases the risk.
- Age: Symptoms usually start in late adolescence or early adulthood.
- Sex: Men are more commonly affected than women.
Symptoms
- Chronic back pain and stiffness: Pain is often worse after periods of inactivity or during the night and improves with exercise.
- Fatigue: Due to inflammation.
- Pain and swelling in other parts of the body: Such as the shoulders, hips, ribs, heels, and small joints of the hands and feet.
- Reduced range of motion: Advanced cases can lead to a decreased ability to perform daily activities and may progress to radiographic axial spondyloarthritis.
Diagnosis
How to diagnose ankylosing spondylitis is typically based on:
- Symptoms: Chronic back pain and stiffness.
- Physical examination: Checking for signs of inflammation and restricted movement.
- Imaging tests: X-rays or magnetic resonance imaging (MRI) scans to detect joint and bone changes.
- Blood tests: Mainly to check for the presence of the HLA-B27 gene and inflammation markers.










