What is reactive arthritis?

Auto-immune disease: An autoimmune disease that develops as a response to an infection, typically causing red, hot, swollen, and painful joints but can also involve other body parts.

Self-limited form: Reactive arthritis (previously called reiter's disease) is a self-limited arthritis that develops as an autoimmune response to an infection (some diarrheal infections, some sexually transmitted infections, some respiratory infections).Very painful swollen joints, sometimes with eye inflammation (uveitis), and urethral inflammation (can hurt to urinate). Treated with nsaids like Ibuprofen or naproxen.