Simple kidney cysts are fluid-filled sacs that develop in the outer layer of the kidney. They can occur singly or multiply, and one or both kidneys may be affected. They are very common, especially in people over about 50, but their cause is unknown. The cysts are not cancerous and do not usually cause symptoms. Rarely, there may be blood in the urine or a cyst may become large enough to press on surrounding tissues, causing back pain. Treatment is not usually necessary, although a cyst that is causing pain may be drained or removed surgically.

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