Reiter's syndrome is a very rare form of spondyloarthropathy. It is similar to reactive arthritis because it can be a complication of a sexually transmitted bacterial infection caused by the Chlamydia bacteria. It can also be caused by salmonella poisoning. The great majority of individuals who contract Reiter's syndrome have a gene marker known as HLA-B27. Besides inflammation of the spine and the lower joints in the back, Reiterâs syndrome also inflames the tendons in the heel and fingers. The heel responds to this by growing bone spurs, which cause their own pain and discomfort. Reiterâs syndrome also causes inflammation of the reproductive organs and the eyes. The eyes grow red, irritated, and painful.