I am having a severe pain in my left kidney some of the time but I am not sure that what was the actual reason for this severe pain. I am worried about my kidney pain I have also consult a doctor and taking medicines but some of the time I am having severe pain without any reason as I have no kidney stone in my kidney. I have research a lot for this severe pain attacks and I have found several ideas why I am having this pain but not sure that the mention reasons were the cause of this pain . Can somebody tell me what was the actual reason of this intolerable pain.