The urinary tract carries urine from the kidneys to the outside of the body. It includes the kidneys, bladder, and tubes that connect them. The tubes from the kidney to bladder are called ureters. The tube from the bladder to the outside of the body is called the urethra. A urinary tract infection (UTI) is an infection in any of these structures.

The Urinary Tract
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UTIs are caused by bacteria. The bacteria may enter the bladder or the kidneys.