The cause of<unk>  remains unknown. However, the disorder is autoimmune — meaning that the body's own immune system starts to attack and destroy cells and tissues (particularly in the joints) for no apparent reason. The immune system is thought to be provoked by changes in the environment, in combination with mutations in many associated genes and/or other causes of differential expression of genes. Experimental studies have shown that certain mutated viruses may be able to trigger<unk> . The disease appears to be more common in girls, and is most common in Caucasians. The cause of<unk> , as the word<unk> " suggests, is unknown and an area of active research. Current understanding of<unk>  suggests that it arises in a genetically susceptible individual due to environmental factors.
Juvenile idiopathic arthritis
Kawasaki disease
Systemic-onset juvenile idiopathic arthritis
Reactive arthritis
Psoriatic arthritis
Rheumatoid arthritis
Relapsing polychondritis
Inflammatory arthritis