The most common complications of acute renal failure are different from those of chronic renal failure. The common complications of acute renal failure are as follows: 1. Disorders of acid-base and electrolyte balance: for example, metabolic acidosis, hyperkalemia or hypokalemia after the sudden appearance of acute renal failure in patients, while the effect on calcium and phosphorus is not obvious; 2. Volume changes: patients have blood pressure changes, for example, after acute renal failure, urine can not be excreted, too much volume will appear Hypertension; if excessive diuresis, the blood pressure of some patients will drop. Young patients may have no other manifestations of various systems, while older patients may induce their underlying diseases. For example, acute renal failure can occur in the elderly, heart failure and digestive system disorders can occur with excessive volume loading. At this time, creatinine suddenly increases, and changes in the blood system will also occur; 3. In acute renal failure, coagulation disorders will also occur, and the patient’s body is both hypercoagulable and prone to bleeding, so the patient will show purple skin spots, easy bleeding, and easy to form blood clots.