A urinary tract infection (UTI) is an infection in the urinary tract. The urinary tract includes the kidneys, the bladder and the urethra. The kidneys are 2 bean-shaped organs that lie against the spine in the lower back. As blood flows through the kidneys, they remove waste and store it in the bladder as urine. The bladder is the balloon-like …

https://familydoctor.org/condition/urinary-tract-infections/