Many people usually think they are healthy, but a health checkup will reveal that they have kidney cysts. Kidney cysts are actually a structural abnormality of the kidney itself, a cystic mass of varying size in the kidney that is not connected to the outside world, most of these cystic masses are filled with fluid and have thin walls, ranging in size from a few centimeters to several centimeters. The incidence of kidney cysts can increase with age, and the incidence of ultrasound in people over 50 years old can reach more than 50%, and the diagnosis can be confirmed by ultrasound, CT, nephrostomy and other examinations. Kidney cysts can be divided into simple kidney cysts, congenital polycystic kidney, multiple kidney cysts, etc. According to the symptoms, the causes of kidney cysts can be congenital or formed later in life. For example, congenital kidney dysplasia, acquired viral infection, excessive mental stress and many other reasons may cause it. Although most patients with cysts do not have obvious clinical features, it is best to have a kidney function test every 6 months and a kidney ultrasound once a year in order to prevent malignant lesions in kidney cysts. People with kidney cysts should not do strenuous exercise to prevent rupture of the cysts leading to hemorrhage. If some cysts are found in the physical examination, there is no need to be too nervous, as most cysts are benign.