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AS tends to first develop in teenagers and young adults. It’s also around three times more common in men than in women.
Symptoms of ankylosing spondylitis
The symptoms of AS can vary, but usually involve:
- back pain and stiffness
- pain and swelling in other parts of the body – caused by inflammation of the joints (arthritis) and inflammation where a tendon joins a bone (enthesitis)
- extreme tiredness (fatigue)
These symptoms tend to develop gradually, usually over several months or years, and may come and go over time.
In some people the condition gets better with time, but for others it can get slowly worse.
Read about symptoms of ankylosing spondylitis.
When to seek medical advice
You should see your GP if you have persistent symptoms of AS.
If your GP thinks you may have the condition, they should refer you to a specialist in conditions affecting muscles and joints (rheumatologist) for further tests and any necessary treatment.
Further tests may include blood tests and imaging tests.
Read about diagnosing ankylosing spondylitis.
Causes of ankylosing spondylitis
It’s not known what causes the condition, but there’s thought to be a link with a particular gene known as HLA-B27.
Read about the causes of ankylosing spondylitis.
Treating ankylosing spondylitis
There’s no cure for AS and it’s not possible to reverse the damage caused by the condition. However, treatment is available to relieve the symptoms and help prevent or delay its progression.
In most cases treatment involves a combination of:
- exercises carried out individually or in groups to reduce pain and stiffness
- physiotherapy – where physical methods, such as massage and manipulation, are used to improve comfort and spinal flexibility
- medication to help relieve pain and reduce inflammation– such as painkillers, anti-tumour necrosis factor (TNF) medication and other forms of biological therapy
Surgery is sometimes needed to repair significantly damaged joints or correct severe bends in the spine, but this is uncommon.
Read about treating ankylosing spondylitis.
Complications of ankylosing spondylitis
The outlook for AS is highly variable. For some people the condition improves after an initial period of inflammation, whereas for others it can get progressively worse over time.
Around 70-90% of people with AS remain fully independent or minimally disabled in the long term.
However, some people eventually become severely disabled as a result of the bones in their spine fusing in a fixed position and damage to other joints, such as the hips or knees.
With modern treatments, AS doesn’t normally affect life expectancy significantly, although the condition is associated with an increased risk of other potentially life-threatening problems.