Notice: Users may be experiencing issues with displaying some pages on stanfordhealthcare.org. We are working closely with our technical teams to resolve the issue as quickly as possible. Thank you for your patience.
There are three different types of urinary tract infections. The type of infection depends on which part of the urinary tract is infected.
A urinary tract infection may involve different sections of the urinary tract including the following:
Urethritis: An infection of the urethra, the hollow tube that drains urine from the bladder to the outside of the body.
Cystitis: A bacterial infection in the bladder that often has moved up from the urethra.
Pyelonephritis: An infection of the kidneys that is usually a result of an infection that has spread up the tract, or from an obstruction in the urinary tract. An obstruction in the urinary tract causes urine to back flow into the ureters and kidneys.
Recognize common symptoms of a UTI so you know when to seek medical attention. Symptoms include frequent urination and a burning or painful sensation when urinating. Learn more about UTI symptoms.