Reactive Arthritis was formerly known as which syndrome?

Reactive arthritis was historically referred to as Reiter's Syndrome. This terminology stems from Hans Reiter, a German physician who characterized the condition in the early 20th century. Reactive arthritis is an inflammatory joint condition that typically occurs as a reaction to an infection elsewhere in the body, most commonly following certain sexually transmitted infections or gastrointestinal infections.

Reiter's syndrome specifically referred to a triad of symptoms: arthritis, urethritis, and conjunctivitis. While the term Reiter's syndrome has been used for many years, it has fallen out of favor due to Reiter's association with controversial historical contexts, leading to the preferred terminology of reactive arthritis.

The other syndromes listed do not share this direct historical association. Still's disease refers to a specific type of juvenile idiopathic arthritis characterized by fever and rash, Sjögren's syndrome involves autoimmune processes affecting moisture-producing glands, and Behçet's syndrome is a systemic vasculitis condition characterized by recurrent oral and genital ulcers and uveitis. Each of these conditions has distinct clinical features and is not synonymous with reactive arthritis.