Kidney cyst three centimeters is not serious, usually kidney cyst is three centimeters is not need to carry out special treatment, simple kidney cyst incidence is relatively high. Generally, with the increase of age, its incidence is gradually increasing, renal cyst is a benign occupational lesion of the kidney. Often, medications are ineffective in treating patients with renal cysts as they are usually not able to shrink the cysts. If there is a kidney cyst with a diameter of three centimeters, there is no clinical discomfort, and it does not cause any degree of damage to the kidneys, usually there is no need for medication or surgical treatment, but the patient needs to do an abdominal ultrasound once every six months to assess the change in the volume of the cyst. If the change in volume is not significant, there is no need to intervene. If the volume increases rapidly within a short period of time, the possibility of malignant tumors needs to be excluded. If the cyst grows rapidly in size to about seven centimeters in a short period of time, surgery is required.