Kidney Cyst Back Pain. A kidney cyst may become infected causing fever and pain. It is a sign of the growth of kidney cyst.

A kidney cyst that bursts causes severe pain in your back or side. The typical sign of a ruptured kidney cyst is pain. This can make it difficult to pinpoint the source of the symptom.
One way to distinguish between back and kidney pain is to think about whether you have done anything recently that is likely to cause back pain.
The pain will be constant in the beginning and changing position does not. If you have done a lot of heavy lifting or have bent over for a long period of time your pain is more likely to be back pain than kidney pain. The cysts may exist for a long time unnoticed until some of these pain or fever symptoms appear. Kidney cysts are when pouches of fluid form on the surface of the kidneys.