In most cases, the causes of a UTI (urinary tract infection) involve a type of bacteria called Escherichia coli (E. coli), which normally lives in the colon. In addition to bacteria, possible causes of a UTI include other microorganisms (such as chlamydia and mycoplasma). While not causes of UTIs, certain risk factors increase the chances of developing a urinary tract infection. Examples of these risk factors include urinary tract problems (such as kidney stones), medical conditions (such as diabetes), and menopause.

 

(Click Causes of UTI for information about the causes of urinary tract infection.)