A kidney cyst is a swelling in the kidney that appears to be a round thin body filled with a fluid and varies a lot in size. The cysts are formed when a vessel becomes swollen in the kidney but the actual event that triggers this is not known. Small kidney cysts can occur commonly in many people and are not a sign of some disease. But if the cysts become too large they can affect the structure and hence the function of the kidney. Cysts become more and more common in older people. There are no clear causes that can associated to kidney cysts but drinking very less water can also cause cysts.
