A ureteral obstruction is a blockage in your ureters. Your ureters are the tubes that carry urine from your kidneys to your bladder. Many conditions, including kidney stones, cancer, and ureteral ...

The urine is taken from the kidneys to the bladder by the ureters. The bladder stores the urine until it is convenient to expel it from the body. Note that 'ureter' differs from the word 'urethra'.