Kidney stones for too long may cause the following hazards: 1. Kidney stones may cause obstruction of the kidney, renal pelvis and renal calyces in the kidney collection system, and obstruction for a long time may cause increased pressure in the renal pelvis and renal calyces, causing abnormal blood supply to the kidneys; 2. Long-term kidney stones may easily cause upper urinary tract infection in the urinary system, which is relatively deep and causes very serious consequences to patients; 3. Stones Long-term in the kidney may cause repeated occurrence of hematuria, because the stones may move inside the renal pelvis and renal calyces, rubbing or colliding everywhere causing bleeding caused by the breakage of the mucous membrane of the renal pelvis and calyces. The small amount of bleeding is mainly manifested in microscopic hematuria, which means that it cannot be seen by the eye and must be seen under a microscope. If the bleeding is more, it will cause carnal hematuria, which is directly visible to the eye.