UTIs can happen anywhere in the urinary system (which includes the kidneys, ureters, bladder, and urethra). UTIs are most common in the bladder. A UTI in the bladder is called cystitis. Infections in the bladder can spread to the upper part of the urinary tract or the kidneys. A UTI in the kidneys is called pyelonephritis or "pyelo."
If you have a UTI, you may have some or all of these symptoms: