<s>[INST] I have some unusual pain in lower back. I think from kidney. Recently I took cholesterol medicine after years of break. I remember that a few years ago I had same problem , same discomfort. I thought is something not right about my kidney. I felt that I am allergic to statin Recently, My urin test showed some blood Shall I be very concern ? Please advice. Thank you very much [/INST] Dear patient statins are known to cause muscle damage in few patients. That may lead to increase protein levels in blood which in turn goes to kidney for excretion and hence may affect your kidney. Chances are few but since your urine test showed blood this needs to be ruled out. I would advise visit to your physician for further examination and investigation like Ultrasound of PUB. Meanwhile stop taking statin if it is possible. </s>