<s>[INST] I am having severe pain in my mid back on the left side. It gets extreme then the reduces slightly, but is constantly there. This happened on Monday, but was fine Tues & Wed. The pain came back again today. I also feel like I have to urinate constantly. [/INST] Hello,I had gone through the case and found that it might be due to renal stone or urinary tract infection.So go for ultrasound of lower abdomen and urine test to find the exact cause.After that take treatment.Hope my answer will be effective for you.Thanks </s>