Ankylosing spondylitis is an inflammatory disease that, over time, can cause some of the vertebrae in your spine to fuse. This fusing makes the spine less flexible and can result in a hunched-forward posture. If ribs are affected, it can be difficult to breathe deeply.
Ankylosing spondylitis affects men more often than women. Signs and symptoms typically begin in early adulthood. Inflammation also can occur in other parts of your body â most commonly, your eyes.
There is no cure for ankylosing spondylitis, but treatments can lessen your symptoms and possibly slow progression of the disease.
Early signs and symptoms of ankylosing spondylitis might include pain and stiffness in your lower back and hips, especially in the morning and after periods of inactivity. Neck pain and fatigue also are common. Over time, symptoms might worsen, improve or stop at irregular intervals.
The areas most commonly affected are:
Seek medical attention if you have low back or buttock pain that came on slowly, is worse in the morning or awakens you from your sleep in the second half of the night â particularly if this pain improves with exercise and worsens with rest. See an eye specialist (ophthalmologist) immediately if you develop a painful red eye, severe light sensitivity or blurred vision.
Ankylosing spondylitis has no known specific cause, though genetic factors seem to be involved. In particular, people who have a gene called HLA-B27 are at greatly increased risk of developing ankylosing spondylitis. However, only some people with the gene develop the condition.
During the physical exam, your doctor might ask you to bend in different directions to test the range of motion in your spine. He or she might try to reproduce your pain by pressing on specific portions of your pelvis or by moving your legs into a particular position. Also, your doctor might ask you to take a deep breath to see if you have difficulty expanding your chest.
X-rays allow your doctor to check for changes in your joints and bones, though the visible signs of ankylosing spondylitis might not be evident early in the disease.
An MRI uses radio waves and a strong magnetic field to provide more-detailed images of bones and soft tissues. MRI scans can reveal evidence of ankylosing spondylitis earlier in the disease process, but are much more expensive.
There are no specific lab tests to identify ankylosing spondylitis. Certain blood tests can check for markers of inflammation, but inflammation can be caused by many different health problems.
Your blood can be tested for the HLA-B27 gene, but most people who have that gene don't have ankylosing spondylitis, and fewer black people with the disease have the gene than do white people.
In severe ankylosing spondylitis, new bone forms as part of the body's attempt to heal. This new bone gradually bridges the gap between vertebrae and eventually fuses sections of vertebrae. Those parts of your spine become stiff and inflexible. Fusion can also stiffen your rib cage, restricting your lung capacity and function.
Other complications might include:
Besides seeing your doctor regularly and taking your medications as prescribed, here are some things you can do to help your condition.
The course of your condition can change over time, and you might have painful episodes (relapses) and periods of less pain (remissions) throughout your life. But most people are able to live productive lives despite a diagnosis of ankylosing spondylitis.
You might want to join an online or in-person support group of people with this condition, to share experiences and support.