Simple renal cysts usually do not affect life expectancy, unless they rupture and cause accidents such as hemorrhage and infection, which may be life-threatening. Renal cyst is a common benign tumor of kidney, usually rarely malignant, most of them do not cause any clinical symptoms, so if the renal cysts are small, they can be left untreated, and can be dynamically followed up and observed. However, we can’t rule out the existence of a small number of huge kidney cysts, due to the cysts are too large on the kidneys caused by the compression, when the cysts are too large, the surface tension of the cysts is also large, easy to be in the role of external forces and lead to the rupture of the cysts bleeding. Therefore, if the renal cyst is large or has already caused the symptoms of lumbar discomfort, it is recommended to have surgery as soon as possible to remove the cyst, the prognosis of the surgery is good, and generally does not pose a danger to life. If kidney cysts exist, it is recommended to go to the hospital as soon as possible to avoid delaying the condition.