<s>[INST] Every now and again I get debilitating pain in my lower back / spine that my doctor doesn t grasp. The pain catches me off guard and stops me from moving. As soon as this happens I lay on my back, with my feet flat on the floor and ensure my back is stretched out and flat. By doing this and rocking my hips, my lower back cracks and the pain in releved. I m concerned what long term effect this cracking my have and what is causing the problem. any advice would be gratefully received. many thanks. [/INST] Hi, Thanks for posting on Chat Doctor. After reading your symptoms I feel that you need to get proper investigations done such as an MRI. You should not ignore this problem. I would strongly suggest that you visit an orthopedic surgeon who can clinically examine you and decide on the treatment plan. He may advise you some exercises for the same. Meanwhile, you must sleep on a hard bed which maintains your posture during sleep as well. Wish you a speedy recovery. Regards </s>