Kidney cysts with a diameter of 5.6 centimeters usually need to be treated, and puncture aspiration and injection of sclerosing agents such as anhydrous ethanol may be considered to prevent recurrence. However, the decision to treat or not to treat depends on the location of the cyst and the nature of the cyst. Simplex renal cysts are prevalent in the middle-aged and elderly population and are usually detected by checking the renal ultrasound. The cause of simple renal cysts has not been clearly defined, and it is currently believed to be acquired. Some scholars believe that simple renal cysts are a manifestation of aging of the kidneys, and the older the age, the higher the chance of developing simple renal cysts. For most of the population, renal cysts are solitary, and a small number of patients will develop multiple renal cysts. Patients usually have no obvious discomfort symptoms, and a few patients may have pain in the kidney area and hematuria. The impact of solitary renal cysts on the human body is generally small. For those who are asymptomatic and have no complications, treatment is generally not required and can be reviewed once every six months to a year. For larger cysts with a diameter of >5cm, puncture aspiration and injection of sclerosing agent such as anhydrous ethanol can be considered to prevent recurrence. Surgery should be considered for patients with huge cysts with volume >500ml, malignant tendency or recurrence after puncture. If the patient finds that the renal cyst is 5.6 cm in diameter, it is recommended to go to a regular hospital in time and receive standardized treatment under the guidance of a doctor.