Hello, I have been experiencing severe flank pain for a few years now. When it comes on, it is usually both sides, sometimes only one side. The pain only lasts for a matter of a few minutes (longest it lasted was probably 40min-1hour) It occurs about once a week or two. I know that flank pain is usually associated with kidneys, but with such intermittent pain over a long period of time, I wonder what it may be