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Hydronephrosis is swelling in one or both kidneys caused by urine buildup. Urine normally flows from the kidneys to the bladder through tubes called ureters. A blockage in the ureters can prevent urine from flowing properly. Urine flow may also be prevented or slowed if your kidneys do not work correctly. Urine flows back into your urinary tract. Pressure builds up in the kidney and causes swelling.



Follow up with your healthcare provider or specialist as directed:

You may need to be referred to a gynecologist, oncologist, or urologist for more tests and treatment. Write down your questions so you remember to ask them during your visits.

Contact your healthcare provider if:

  • Your abdomen feels full.
  • You have a change in how much or how often you urinate.
  • You urinate more times at night and in larger amounts than during the day.
  • You have mild lower back pain or pain on one side when you urinate.
  • You have questions or concerns about your condition or care.

Return to the emergency department if:

  • You have severe, stabbing back pain.
  • You have blood in your urine.
  • You cannot urinate, or you urinate very little.

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The above information is an educational aid only. It is not intended as medical advice for individual conditions or treatments. Talk to your doctor, nurse or pharmacist before following any medical regimen to see if it is safe and effective for you.