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Ankylosing spondylitis is an arthritis condition, which is also known as spinal arthritis, or morbus Bechterew. The illness primarily affects the joints in the vertebral column, ligaments and tendon attachments, as well as the joints between the sacrum and the ileum. Ankylosing spondylitis is caused by an inflammation that is not caused by bacteria. The inflammation usually leads to calcification of the joints.
Reverting pain and stiffness in the lumbar, thoracic and neck region are common symptoms in patients suffering from ankylosing spondylitis. The pain often radiates to the groin and down the leg. The condition usually initiates in the sacrum and lumbar region after which it spreads to the entire back, neck and chest area. The pain and stiffness is usually worst in the morning, but can often be eased with medicine and physical activity.
The illness may occasionally also affect the joints in the arms and legs, e.g. the hips, knees and shoulder joints. In addition, one third of patients with ankylosing spondylitis will be affected by inflammation in the iris of the eye. The eye becomes red and painful and the vision becomes blurred. More tear fluid is produced. The eye inflammation usually only affects one eye at the time. It is important to visit an ophthalmologist at the first sign of inflammation of the iris.
Ankylosing spondylitis affects posture because of the calcification of the joints which then causes the lumbar spine to lose its natural lordosis. This may ultimately lead to a more or less pronounced kyphosis of the spine. The thoracic cage will often crumple up and loose its springy and elastic characteristics. Thereby the chest is subject to a greater strain than under normal circumstances. | 
