Who gets ankylosing spondylitis?
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AS usually develops in teenagers or young adults. It rarely first develops after the age of 40. It is three times more common in men than women. There may be a family history with two or more members of a family being affected. About 1 in 1000 people in the UK have AS.
What causes ankylosing spondylitis?
The cause of AS is not known. There is a strong genetic (hereditary) part. Something may 'trigger' AS to develop in people who have an inherited tendency to have it. The trigger is not known.
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