Sitting on the ground causes back pain, which may be caused by sacrococcygeal fracture, lumbosacral soft tissue contusion, lumbar vertebrae fracture, etc., and can be intervened by drugs, surgery or physical therapy. 1. Sacrococcygeal fracture: it can lead to low back pain, accompanied by pain and swelling in the sacrococcygeal area, usually without special treatment, if the pain is serious, you can use analgesic drugs such as celecoxib, and can be combined with cold compresses in the early stage, hot compresses in the later stage and other physical therapy measures. 2. Lumbosacral soft tissue contusion: soft tissue injuries such as muscle strains occur here, lumbar pain can occur, but the degree of pain is light compared to the fracture, local edema, fever and other manifestations, usually after rest and braking can be relieved. 3. Lumbar vertebra fracture: lumbar vertebra compression fracture, transverse process fracture and other lumbar vertebra fracture, lumbar pain can occur, and at the same time, if accompanied by nerve injury, lower limb sensory abnormality, numbness, dyskinesia and other symptoms. Severe pain can be relieved with drugs such as celecoxib and ibuprofen; if there is nerve damage or unstable fracture, surgical treatment is needed. Celecoxib and other drugs need to be used under the guidance of clinicians, unauthorized use of drugs is prohibited; post-traumatic lumbar pain or abnormal sensation, it is recommended to go to the hospital in a timely manner.