Most of the renal cysts do not have obvious symptoms, if the diameter of renal cysts reaches 10cm or more will cause the patient to have symptoms, the main symptom is pain in the flanks or back. If the renal cyst bleeds or ruptures, the wall of the cyst expands and the pericardium is compressed or pulled, which can lead to severe pain in the lower back. If there is infection in the cyst, in addition to pain, there will be fever and generalized muscle pain, nausea and vomiting. Usually, renal cysts do not cause hematuria, but in some cases, if the cyst compresses the renal parenchyma, it can also lead to increased blood pressure, which can lead to dizziness and headache.