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A urinary tract infection (UTI) is an infection from microbes. These are organisms that are too small to be seen without a microscope. Most UTIs are caused by bacteria, but some are caused by fungi and in rare cases by viruses. UTIs are among the most common infections in humans. A UTI can happen anywhere in your urinary tract.
The most common cause of UTIs are bacteria from the bowel that live on the skin near the rectum or in the vagina, and which can spread and enter the urinary tract through the urethra. 1  Once these bacteria enter the urethra, they travel up, causing infection in the bladder and sometimes other parts of the urinary tract.