Masturbation is generally not harmful to the kidneys. Masturbation is the process of frequent stimulation of one’s genital organs to obtain sexual pleasure. Moderate masturbation is usually not harmful to the body, but excessive masturbation is harmful to the body, for example, it can cause urethritis, premature ejaculation, and glans phimosis. Some teenagers may suffer from mental health problems because they are addicted to masturbation. Kidneys are part of the urinary system and are mainly responsible for filtering impurities in the body, maintaining the balance of body fluids and electrolytes, keeping the internal environment stable, and also possessing endocrine functions such as regulating blood pressure. Masturbation may be related to sexual organs, sexual function and psychological state, while the kidneys belong to the urinary system, the kidneys will not be directly involved in the process of sexual activity, the kidneys are mainly responsible for maintaining the body’s water, electrolyte stability, to maintain the stability of the internal environment and so on. Common causes of kidney damage are chronic nephritis, diabetes, hypertension, polycystic kidney, kidney stones and so on. Therefore, masturbation generally will not harm the kidneys, but still do not recommend frequent masturbation, it is recommended to reduce sexual stimulation, increase outdoor aerobic exercise, distraction and so on.