Juvenile Idiopathic Arthritis

What is Juvenile Idiopathic Arthritis?

Juvenile means arthritis began before you were 16 years old.
Idiopathic means that the cause is not known.
Arthritis means one or more of your joints is hot to touch and inflamed.

Types of JIA:


This is the most common type and involves arthritis in four or fewer joints. This type of arthritis has the hightest chance of developing Uveitis (inflammation of the eyes).


This involves arthritis in five or more joints.

Systemic Onset JIA

This is characterised by the presence of high fevers, a rash and children with So-JIA are quite often ill with weight loss, enlarged lymph nodes and anemia. Macrophage activation syndrome (MAS) is a rare and potentially lethal complication of systemic-onset juvenile idiopathic arthritis, resulting from uncontrolled activation and proliferation of T lymphocytes and macrophages.

Psoriatic Arthritis

This is another subtype of JIA in which a child has chronic arthritis and a skin rash called psoriasis which looks like a dry scaly rash.

Enthesitis - related Arthritis

In addition to chronic arthritis these children have inflammation of structures such as ligaments around the joint.

Undifferentiated Arthritis 

Sometimes young people don't fit neatly into one group and the condition is defined as undifferentiated. 

For more Information on JIA: