Urinary tract infection (UTI) is an infection in any part of your urinary system-such as kidneys, ureters, bladder and urethra. Most infections involve the lower urinary tract-the bladder and the urethra. Comparing with mens, women is at greater risk of developing a UTI than men. Infection of bladder can be painful and annoying. However, serious consequences can occur if a UTI spreads to your urinary system.