Acute renal failure can be self-healing in some patients. Renal failure is categorized into acute renal failure and chronic renal failure. Chronic renal failure causes irreversible damage to renal function, the condition will only become more and more serious, and will not appear to be self-healing. Acute renal failure is caused by drug factors, urinary tract obstruction, acute reduction of renal blood flow, etc. If the onset of acute renal failure is relatively short, the renal function can be restored under the removal of the causative factors, such as acute reduction of renal blood flow in patients with major blood loss, resulting in acute renal failure, rehydration and other therapies can be given to return renal blood flow to normal, and renal function may also return to normal at this time. The renal function may also return to normal.