There are differences in the onset time, onset symptoms and kidney volume size between acute and chronic renal insufficiency. 1. Onset time: the structure and function of the kidney of patients with acute renal insufficiency are abnormal for a few days to ten days. In patients with chronic renal insufficiency, the decay of renal function will last for more than three months. 2. Symptoms: Generally, the symptoms of acute renal insufficiency are oliguria or even anuria. On the other hand, patients with chronic renal insufficiency will have symptoms such as nausea, fatigue, dizziness and excessive urination. 3. Kidney volume size: you need to go to the hospital for ultrasound examination to determine the size of the kidney volume, usually chronic renal insufficiency patients will have a certain amount of shrinkage of the kidneys, which is smaller than that of acute renal insufficiency patients. Whether it is acute or chronic renal insufficiency, patients should go to the hospital in time to receive regular treatment, do not delay to avoid aggravation of the condition.