Improvement of renal abscess is characterized by: improvement of clinical symptoms, improvement of blood infection index, and improvement of imaging. 1. Improvement of clinical symptoms: the clinical manifestations of renal abscess mainly include fever, lumbar pain and abdominal pain. If the patient does not have fever, the maximum body temperature decreases, the fever cycle shortens, and the lumbar or abdominal pain improves, all of them are the signs of improvement of renal abscess. 2. Blood infection indexes: blood routine of renal abscess can suggest that leukocytes and neutrophils are elevated; leukocytes and even pus cells can be seen in urine routine; calcitoninogen, CRP and other infection indexes can be elevated; if the rechecking of blood routine, urine routine, calcitoninogen, CRP and other infection indexes are decreased compared with the previous ones, it is a sign of improvement. 3. Imaging such as renal ultrasound, renal CT suggests that the scope of the abscess is smaller than before, and the morphology of the kidney is clearer than before, etc. All these indicate that the kidney abscess has signs of improvement. Warm reminder: renal abscess treatment is not standardized, combined with sepsis, renal failure and other complications, you need to consult the hospital in a timely manner, in accordance with the doctor’s instructions standardized treatment.