<s>[INST] hi my son is 25 and as back pain , he is fit but he had this pain in his back brought him to the ground he had to try his hardest to get back in the care could not more for an hr , and then when he tryed to get back to his apartment he fell again and someone had to help him , can you please tell me what he could be [/INST] Hi Thanks for your queryI hope the other joint's beside the spine are normal,please share.Does he has more pain and stiffness in the morning?He needs physical examination and blood test to rule out spondyloarthropathy .Please share.Take care </s>