A urinary tract infection (UTI) is an infection that affects any part of the urinary system, which includes the kidneys, bladder, ureters and urethra. They are most commonly caused by bacteria and can be uncomfortable and painful. UTIs are more common in women, but anyone can get a UTI. Recognizing the symptoms can help you get the treatment you need early before the infection worsens. Symptoms Symptoms of a UTI can include: A strong, persistent ...