Urinary tract infections (UTIs), including bladder infections (cystitis) and kidney infections (pyelonephritis), are generally caused by bacteria that are normally present in the digestive system.  Women get UTIs more often than males do.

Early symptoms of a UTI may include burning or pain during urination and itching or pain in the urethra.  There may also be discomfort in the lower abdomen or back and a frequent urge to urinate without being able to pass much urine.  The urine may be cloudy or reddish in color and may have an usual odor.