A kidney pain is a constant pain that feels like a dull ache on one side of the upper part of the back or flank.
How do you know when you are experiencing kidney pain and not just a simple back pain caused by muscle-related problems? A simple flank or back pain can be attributed to other conditions easily because the symptoms of kidney problems do not reveal right away.
It takes time for these symptoms to show and they usually show in the very late stages when there are large amounts of protein found in the urine or the kidneys are already failing.
Source : healthmagaz.com/kidneys/kid...