<s>[INST] I have been experiecing pain on my left hip and buttocks that extends down my leg and had steroid injections in August that helped until Janurar now I am having pain in my lower back and up to my mid back. this pain is extreamly worse at night when trying to sleep and now when I have been on my feet all day. Any clue whats going on? [/INST] Hi and thanks for your questions, what you are describing is classical polyarthritis. This could mist of the time be of hematologic origin. Autoimmune diseases like rheumatoid arthritis, systemic lupus erythematous are generally implicated. Conditions like polymyalgia rheumatic must also be excluded. Laboratory exams including the rheumatoid factor, erythrocyte sedimentation rate, C reactive protein, Anti-Nuclear Antibody measure, CANCA and panda are usually of diagnostic importance. X-rays at times could be important too. Consult a rheumatologist for a comprehensive and appropriate care. Thanks and best regards, Luchuo, MD. </s>