Two types: dysenteric onset or venereal onset.
One with diarrhea
(caused by certain bacteria
. The venereal trigger is chlamydia, & urethral irritation and discharge is common in men initially. People with reiter's syndrome usually have the hla-b27 antigen, or similars: b40, b41, b7. Reiter's usually affects the feet, sijs, and tendons and eyes.