Acute renal failure symptoms can be divided into oliguria, polyuria and recovery phase according to clinical manifestations. The main symptoms include nausea, vomiting, diarrhea, dizziness and so on. 1. Oliguria stage: there may be reduced urine output, electrolyte disorder and acid-base balance imbalance in the body, edema, hyperkalemia, metabolic acidosis and so on. 2. Polyuria: Polyuria is actually the continuation of oliguria, after several days, there may be a significant increase in urine output, edema gradually subsides, blood pressure drops and other symptoms. 3. Recovery period: the kidney function is basically restored in this period, because the patient’s physical digestion may appear nutritional deficiencies, muscle weakness or peripheral neuropathy. When the patients have the above symptoms, they need to go to the local hospital as soon as possible to get a clear diagnosis and early treatment.