Hello! Glad to answer your question! The so-called "waist" refers to the kidney, but the waist usually refers to the waist, of course, the kidney is at the waist. But if low back pain is not necessarily a kidney problem, lumbar muscle strain, gynecological diseases, gallstones and so on. May be the cause of low back pain. If you have any questions, please ask them. If you are satisfied, please adopt them. Thank you!