Is epididymitis an sti or a common thing like a cold that comes and goes?

STI: A cold come come and go but not epididymitis or sti. The exception is a chlamydial infection which can come and stay without you knowing it until complications develop. Epididymits requires a visit to the urologist to determine whether the treament could be just observation with analgesics or treament with an antibiotic. A urine test can detect gc and chlamydia at your doctor's office.