Ankylosing spondylitis is a type of inflammatory arthritis that may affect your spine and the sacroiliac joints in the pelvis.
It tends to affect men more than women, and it can flare up or come and go over time.
Signs and symptoms may vary from person to person. But, they usually include pain and stiffness in the lower back and hips.
The pain is often worse at night or after periods of inactivity.
There is no cure for ankylosing spondylitis (AS).
However, there are treatments that can help ease the symptoms and prevent the condition from getting worse.
These include medication to reduce inflammation and pain, rest or physical therapy and surgery.