Kidney injury caused by stones is categorized into two types. Acute complete urinary tract obstruction can restore renal function after timely relief of the obstruction; chronic incomplete urinary tract obstruction often leads to renal insufficiency, which cannot be fully recovered. 1. Acute complete urinary tract obstruction: the first narrowing part of the ureter is the renal pelvic ureteral junction, once the stone blocks this part, it can cause acute complete urinary tract obstruction. If treated in time, the renal injury can usually be recovered. 2. Chronic incomplete urinary tract obstruction: the stone is usually embedded in the ureter, and in serious cases, it can be complicated by pyelonephritis, renal pus, hydronephrosis caused by the stone, and so on. Bilateral upper urinary tract stones cause complete bilateral urinary tract obstruction and complete upper urinary tract obstruction of isolated kidney, which can lead to anuria and uremia. Renal function is also damaged to some extent after the stones are removed. Generally, it cannot be fully recovered after treatment. If stones appear, patients need to consult the doctor in time for examination and early treatment.