This condition is caused when the kidneys excrete urine via a narrow tube called the ureter, which carries this waste to the bladder. A blockage or a restriction in the ureter means urine cannot reach the bladder and is forced to flow back towards the kidney.
orensila / Getty Images
Receive updates on the latest news and alerts straight to your inbox.
This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other healthcare professional.