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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.
What Happens. Urinary tract infections (UTIs) typically occur when bacteria from the rectal area enter through the urethra and travel up the urinary tract to the bladder or kidneys. Typically, UTIs cause urinary symptoms, such as pain or burning during urination.hat Happens. Urinary tract infections (UTIs) typically occur when bacteria from the rectal area enter through the urethra and travel up the urinary tract to the bladder or kidneys. Typically, UTIs cause urinary symptoms, such as pain or burning during urination.