Whether or not exercise sweating hurts the kidneys depends mainly on whether or not the kidney function is impaired. If you are a normal person, sweating a lot will not hurt your kidneys; if you are a patient with kidney disease, you may suffer from insufficient perfusion of the kidneys, which may damage your kidneys. For healthy people, heavy sweating is normal, except for the loss of water, it usually does not cause significant harm to the kidneys and the body, and it is enough to replenish water in moderation. However, if you are suffering from nephritis, kidney failure and other kidney diseases, exercise sweating may be insufficient water, causing a decrease in the effective circulating blood volume, when renal perfusion is reduced, it will lead to acute kidney injury, blood creatinine increase, which will lead to aggravation of the patient’s condition. Exercise itself is good for the body, but everyone still needs to exercise reasonably according to their own situation, so as not to cause physical injury. Patients with kidney disease are advised to visit regular hospitals in time and standardize the treatment under the guidance of doctors.