<s>[INST] I am having pain in my lower back on right side. It has gotten worse over last three days . I have passed a kidney stone on my left side about one year and a half ago, but that pain was in my lower abdomen closer to my left hip. Don t know if this could just be muscle pain or something more serious ? [/INST] Hello, I have studied your case. Your flank and back pain can be due to muscle strain or renal calculi. You may need x-ray and Ultrasonography. And also check your it B12 and it D3 level. Medication like methylcobalamine and analgesic will reduce pain. You can do yoga exercises and focus on spine extension exercises. You may consult physiotherapist for guidance. He may start TENS, or ultrasound which is helpful in your case. Hope this helps. Wish you a speedy recovery.  Take care </s>