Reiter’s syndrome is an inflammatory reaction to an infection somewhere in the body. It usually follows an infection of the urinary, genital, or digestive tract. It is treated with rest and medication.

Reiter's syndrome is triggered by certain infections. It is usually caused by the bacterium that causes chlamydia. Chlamydia is transmitted through sexual contact with an infected partner. The infection can also begin in the digestive system. In these cases, the infection occurs after eating food tainted with bacteria.