This is related to the damage to the urinary tract caused by the stones, which can cause the mucous membrane of the urethra to break down or erode over a long period of time, which can result in a small amount of blood leakage. When blood is mixed with urine for routine urinalysis, the number of red blood cells can be increased, and it is also associated with strenuous activities of kidney stone patients. Therefore, it is recommended that patients with kidney stones go to the hospital for timely examination, consultation and treatment, and remove the stones in time through extracorporeal shock wave lithotripsy or surgery, so that there will be no mucosal irritation, mucosal friction and mucosal erosion and bleeding in the kidney, and the urine routine examination can be completely restored to normal.