A urinary tract infection, or UTI, is an infection that can happen anywhere along the urinary tract. Urinary tract infections have different names, depending on what part of the urinary tract is infected.
- Bladder -- an infection in the bladder is also called cystitis or a bladder infection
- Kidneys -- an infection of one or both kidneys is called pyelonephritis or a kidney infection
- Ureters -- the tubes that take urine from each kidney to the bladder are only rarely the site of infection