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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.
UTIs occur when bacteria enter and infect the urinary tract. UTIs can affect several parts of the urinary tract, but the most common type of UTI is a bladder infection (also known as cystitis). The body can sometimes fight the bacteria without any problems; however, the infection can cause discomfort and may sometimes spread to the kidneys.