Enthesitis-related JIA

Enthesitis-related JIA is a type of juvenile idiopathic arthritis (JIA).

This form of JIA affects the places where tendons attach to the bone (these places are called entheses), causing inflammation. It often affects the joints of the leg and spine.
In contrast to the uveitis seen with the other types of JIA, this type of JIA is associated with a red painful eye, acute uveitis.
You may develop stiffness in the neck and lower back in your teens or as a young adult.
There may be a family history of ankylosing spondylitis or inflammatory bowel disease because of a particular genetic marker called HLA-B27.