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The symptoms of ankylosing spondylitis may differ among individual sufferers. Usually the disease is progressive and slow in onset and development.
Sometimes the symptoms may take years to manifest and develop.
Symptoms usually start during later teenage years or during young adulthood. The symptoms vary in intensity over the years and may improve or get worse over many years.
It usually begins between ages 15 and 35 years (average 26 years). About 80% of patients develop the condition before they are 30 years of age and less than 5% present with the symptoms at an age above 45 years.
Men are around two to three times more likely to suffer from this condition. The initial symptom is typically a dull pain that is insidious or slow in onset.