<s>[INST] Had lower back pain (lower lumbar) since 2 months which improved with massage and exercises.  X-ray taken few weeks ago was fine.   However since yesterday started getting pain in mid back region which is there every time  while I lie flat on back -- throbbing pain acute/intense that doesnt go away unless I sleep on the side.  Goes away on standing and sitting. [/INST] Hi,Thanks for writing in.You might have developed a muscle spasm of the muscles in your back region. This happens due to sudden undesired movement or lifting weights. Please take rest and apply muscle relaxant pain killer combination ointments.Hope this helps </s>