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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.
Other common causes of UTIs include the following: 1  Urethritis: Burning urination is often the result of urethritis, the infection of the urethra. 2  In men, urethritis can also cause penile discharge. 3  Pyelonephritis: Pyelonephritis occurs when a bladder infection spreads to the kidneys.