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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.
Infections that commonly cause UTI symptoms include: 1  Bladder infections, which are the most common type of UTI, and occur most often in sexually active women ages 20 to 50. 2  Kidney infections, which are less common and more serious than bladder infections.  Prostatitis and epididymitis.