Sudden pain in the lumbar spine, there are urinary stones, acute lumbar sprain, lumbar disc herniation and small joint disorders these lesions may be. If the painful area is more pronounced, like colic in nature, or even a little nausea or vomiting, it may be a urinary stone, so you should go to the hospital for ultrasound to determine the size of the stone and then decide how to treat it next. If the stone is particularly large, it may require extracorporeal lithotripsy or surgery. If there are no such symptoms, it is possible that the lumbar spine itself is diseased and the muscles behind the lumbar spine are in a state of tension during bending and sitting, so the pain will increase. Therefore, you should rest in bed as much as possible, avoid bending and sitting for a long time, stand for a long time, apply topical ointment that activates blood stasis and relieves pain in the painful place, do hot compresses, massage, physical therapy, and if necessary, consider the treatment of local closed injection, insist on three weeks to a month will have a significant improvement. If you can’t, you have to go to the hospital for CT and MRI examination of the lumbar spine to determine the severity of the specific lesion of the lumbar disc herniation.