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Are Kidney Cysts Harmful?

Will the cyst on my kidney turn into cancer?
The doctor says I have a cyst on my kidney but did not explain what to do or why I got it. Will it turn into cancer? I had renal failure (caused by a drug) 30 years ago and am now in good health. I take medicines for blood pressure and rosacea. Thank you.


Renal experts explain that simple kidney cysts are common and benign (not cancerous). For as-yet-undiscovered reasons, people who develop these cysts often have high blood pressure, too. Simple kidney cysts are not inherited.

Most cause no symptoms and are harmless to the kidney. Treatment may be needed if a cyst becomes infected or enlarged. Nearly 30 percent of people over age 70 have at least one simple kidney cyst, according to the National Institute of Diabetes and Digestive and Kidney Diseases.

Medical Mailbox supplements the advice of your healthcare provider, whom you should consult for personal medical problems.

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2 Comments

  • Nosen Akele

    i am 32years old and have a cyst covering my entire left kidney,the CT scan shows that it is benine but it is quite large-about 10cm in size.It is not causing any serious pain but i feel a little discomfort from time to time.What can i do about it?

  • Susan

    My Urologist told me that if the cysts reach 5 cm to 7 cm, they tend to start causing discomfort at that size and may dislocate other organs. At that point, the treatment used at this place is to put the patient under a CT scan and locate the cyst and go invasive through the skin with a fine needle to aspirate it and suck out the fluid completely. Then, they inject something to collapse the cyst cell walls so that no more fluid can hang out there. There may be possible side effects.