Snapshot A 32-year-old man presents with redness of the eye as well as discharge. He reports that he experiences pain with urination and stiffness and pain of the knee and ankle. He says that he had a sexually transmitted disease approximately 5 weeks ago but is otherwise healthy. On physical exam there is conjunctivitis, asymmetric oligoarthritis, and discharge from the urethral meatus. Introduction Clinical definition login to view 7 more bullets Epidemiology Demographics login to view 5 more bullets Risk factors login to view 1 more bullet Etiology Genitourinary pathogens login to view 2 more bullets Gastrointestinal pathogens login to view 4 more bullets Pathogenesis login to view 1 more bullet Presentation Symptoms login to view 4 more bullets Physical exam login to view 8 more bullets Studies Labs login to view 4 more bullets Differential Ankylosing spondylitis Enteropathic arthritis Septic arthritis Gonococcal arthritis Gout Pseudogout Rheumatoid arthritis DIAGNOSIS Diagnostic criteria login to view 1 more bullet Treatment Medical login to view 6 more bullets Complications Cardiac login to view 2 more bullets Prognosis Most cases spontaneously recover