Does masturbation affect the kidney?

No. Masturbation does not normally harm the kidneys or cause kidney failure. There is no medical evidence that masturbation damages healthy kidneys or affects how they work. If you have symptoms such as pain in your side or lower back, blood in your urine, swelling, burning while urinating, or a change in how often you urinate, these should not be assumed to be caused by masturbation. It is likely they may have another cause and should be evaluated by a doctor. So, if your kidneys are healthy and you do not have any unusual symptoms, there is generally no reason to worry that masturbation is harming your kidneys.