Kidney cyst 5cm causing hydronephrosis usually requires surgery. After kidney cyst 5cm causing hydronephrosis, the body will have more obvious discomfort, usually need to be treated by surgery. A 5cm renal cyst is a large cyst, and will cause some pressure on the surrounding blood vessels, urethra and organs, causing discomfort. If the cyst is large and exerts strong pressure on the organs, it may lead to decreased kidney function or hydronephrosis, which may require surgical treatment. Kidney cysts are usually caused by genetic factors, age factors and other factors that lead to the appearance of lumps in the kidneys, causing the occurrence of kidney cysts. Kidney cysts may cause pain, abdominal lumps and other symptoms, which can be treated by surgical methods such as renal cyst puncture and sclerotherapy under the guidance of a doctor. If the phenomenon of renal cyst and cause hydronephrosis, you should go to the hospital in time, so as not to delay the condition, to avoid adverse consequences, daily life, need to pay attention to rest, avoid overwork, appropriate exercise, reasonable diet.