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Pronounced: hi-dro neff-ro-sis
by Laurie LaRusso, MS, ELS
Hydronephros is a build-up of urine in the kidneys. The kidney tubes swell from the excess urine pressure. It can happen when urine cannot drain into the bladder of if the bladder not draining well. The condition may affect one or both kidneys. Hydronephrosis is not a disease, but a symptom of a problem with the urinary system.
Hydronephrosis in adults is usually caused by a blockage, which can occur with many types of obstruction, such as:
It can also happen when poor bladder function causes a higher urine pressure that backs up into the kidney.
Risk Factors TOP
Factors that may increase your chance of hydronephrosis include:
Hydronephrosis may or may not cause any symptoms. If symptoms occur, they may include:
You will be asked about your symptoms and medical history. A physical exam will be done. It may include a pelvic or rectal exam to feel for blockages. You may be referred to a urologist and/or nephrologist for further diagnosis and treatment.
Your bodily fluids may be tested. This can be done with:
Imaging tests may be done to evaluate the urinary system. This can be done with:
A catheter may be inserted into the bladder to drain excess urine from the kidney. Some causes of hydronephrosis may also be managed with observation, such as pregnancy and kidney stones.
Treatment options include:
Depending on the cause, hydronephrosis may be treated with:
Surgery is not always needed, but it may be necessary in some cases. Procedures may include:
National Institute of Diabetes and Digestive and Kidney Diseases
National Kidney Foundation
Kidney Foundation of Canada
Hydronephrosis. Cleveland Clinic website. Available at: https://my.clevelandclinic.org/health/articles/hydronephrosis. Updated March 18, 2014. Accessed April 26, 2017.
Hydronephrosis. National Kidney Foundation website. Available at: https://www.kidney.org/atoz/content/hydronephrosis. Published 2015. Accessed April 25, 2017.
Hydronephrosis. NHS Choices website. Available at:
...(Click grey area to select URL)
Updated June 23, 2015. Accessed April 25, 2017.
Nephrolithiasis. EBSCO DynaMed Plus website. Available at: http://www.dynamed.com/topics/dmp~AN~T114904/Nephrolithiasis. Updated January 15, 2017. Accessed April 25, 2017.
Obstructive uropathy. Merck Manual Professional Version website. https://www.merckmanuals.com/professional/genitourinary-disorders/obstructive-uropathy/obstructive-uropathy. Updated April 2016. Accessed April 26, 2017.
Last reviewed April 2017 by EBSCO Medical Review BoardMichael Woods, MD FAAP
Last Updated: 5/28/2014
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