What Causes Spondylitis? | MySpondylitisTeam

Connect with others who understand.

sign up log in
Resources
About MySpondylitisTeam
Powered By

What Causes Spondylitis?

Medically reviewed by Ariel D. Teitel, M.D., M.B.A. — Written by Kelly Crumrin
Updated on July 20, 2021

Spondylitis (also called axial spondyloarthritis or axSpA) is an autoimmune disease in which the immune system mistakenly attacks the joints and other tissues in the same way it would normally fight viruses or bacteria.

The specific cause of spondylitis is unknown, although it likely involves both hereditary and environmental factors.

People under age 45 are more likely to develop spondylitis than those older. Onset is most often in the 20s or 30s.

Risk Factors for Spondylitis

It is important to note that while science is good at finding correlations, or apparent relationships, between factors and disease, correlation does not prove that the risk factor causes the disease. Many risk factors for spondylitis have been identified and are being studied, but none have been pinpointed as the cause of spondylitis.

Hereditary Risk Factors

If you have a parent or sibling with spondylitis, your risk for developing spondylitis is three times higher than for someone with no relatives who have spondylitis. The risk for the general population to develop spondylitis is only 1 percent, so the risk of someone with a close family member with spondylitis is still only 3 percent. Amongst identical twins, if one twin has spondylitis, the other twin has approximately a 50 percent chance of developing the disease. For this reason, most researchers agree that genetic and environmental factors both contribute to the cause of spondylitis.

More than 60 genes have been identified as playing a role in spondylitis risk. One gene, HLA-B27, is present in many people who are diagnosed with spondylitis. HLA-B27 is a more influential risk factor for spondylitis in people of some ethnicities. HLA-B27 is found in:

  • 95 percent of those of European descent who are diagnosed with spondylitis
  • 80 percent of those of Mediterranean descent with the disease
  • 50 percent of those of African descent who have spondylitis

Testing positive for HLA-B27 does not mean that you will definitely develop spondylitis. Only about 2 percent of those with the gene are diagnosed with axSpA.

Research has shown that men are twice as likely as women to be diagnosed with axSpa. However, researchers now believe that the condition may be frequently underdiagnosed or misdiagnosed in women, compared to men.

Did you inherit the HLA-B27 gene? See if you’re at risk of spondylitis.

Environmental Risk Factors

Most researchers do not believe that genetics alone determine who gets spondylitis. However, research has not yet identified which environmental factors play a role in causing the disease. Some evidence indicates that bacterial infections, especially those affecting the gastrointestinal system, may trigger an inflammatory reaction that develops into spondylitis. A similar theory suggests that spondylitis develops when there is an imbalance in the bacteria colonizing the intestines. Smoking is also theorized to increase the risk for developing spondylitis.

Condition Guide

Updated on July 20, 2021
All updates must be accompanied by text or a picture.

Become a Subscriber

Get the latest articles about spondylitis sent to your inbox.

Ariel D. Teitel, M.D., M.B.A. is the clinical associate professor of medicine at the NYU Langone Medical Center in New York. Review provided by VeriMed Healthcare Network. Learn more about him here.
Kelly Crumrin is a senior editor at MyHealthTeam and leads the creation of content that educates and empowers people with chronic illnesses. Learn more about her here.

Recent articles

Headaches aren’t the first symptom that comes to mind with ankylosing spondylitis (AS). But for m...

Can Ankylosing Spondylitis Cause Headaches?

Headaches aren’t the first symptom that comes to mind with ankylosing spondylitis (AS). But for m...
Living with ankylosing spondylitis usually involves managing symptoms like back pain or joint pai...

6 Ways Ankylosing Spondylitis Can Affect the Nails

Living with ankylosing spondylitis usually involves managing symptoms like back pain or joint pai...
“I have a lot of back pain, and it scares me that my spondylitis is going to make me wheelchair-b...

Mobility Devices for Ankylosing Spondylitis: What You Should Know

“I have a lot of back pain, and it scares me that my spondylitis is going to make me wheelchair-b...
If you’re experiencing lower back or neck pain with ankylosing spondylitis (AS), you may wonder i...

Spinal Stenosis and Ankylosing Spondylitis: 4 Things To Know

If you’re experiencing lower back or neck pain with ankylosing spondylitis (AS), you may wonder i...
Living with ankylosing spondylitis (AS) sometimes means dealing with serious pain on the job, and...

How Mick Mars Learned To Live With Ankylosing Spondylitis

Living with ankylosing spondylitis (AS) sometimes means dealing with serious pain on the job, and...
Do you experience bone pain, especially when resting? This may be a symptom of bone marrow edema ...

Bone Marrow Edema and Ankylosing Spondylitis

Do you experience bone pain, especially when resting? This may be a symptom of bone marrow edema ...
MySpondylitisTeam My spondylitis Team

Thank you for subscribing!

Become a member to get even more:

sign up for free

close