Urinary tract infection is a catchall phrase that is used loosely in many different ways. Ureaplasma infections are sexually transmitted infections (STI) that can lead to urinary symptoms. However, not all bacterial infections in the bladder are sexually transmitted. In fact, most bacterial cystitis infections (bladder infections) are not sexually transmitted. There are also upper urinary tract infections (kidney infections) that are not sexually transmitted and are often called UTIs, instead of pyelonephritis. In addition, many “UTIs” are not infections at all but rather urethral irritation or pain.