Definition of Reactive arthritis:

Reactive arthritis is a group of inflammatory conditions that involves the joints, urethra, and eyes. There may also be sores (lesions) on the skin and mucus membranes.

Causes, incidence, and risk factors:

The exact cause of reactive arthritis is unknown. It occurs most commonly in men before the age of 40. It may follow an infection with chlamydia, campylobacter, salmonella, or yersinia. Certain genes may make you more prone to the syndrome.

The disorder is rare in younger children, but may occur in adolescents.