Lumbar pain after running may be caused by excessive exercise, or it may be caused by lumbar disc herniation, lumbar vertebral osteophytes, and other diseases such as fasciitis. 1. Excessive exercise:It may be caused by excessive exercise. Excessive exercise will lead to the accumulation of lactic acid in the lumbar muscles, so the symptoms of lumbar pain will appear after running. 2. Lumbar disc herniation:Lumbar disc herniation is mainly caused by disc lesions, and the main symptoms are lumbar pain, radiating pain in the lower limbs, and urination and defecation disorders. 3. Lumbar spondylolisthesis: a chronic degenerative disease of the bone and joint, there will be lumbar pain, stiffness, swelling, numbness in the legs and other manifestations. 4. Other:Fasciitis, lumbar muscle strain, lumbar sprain and other diseases may also have the performance of lumbar pain after running. If the back pain is caused by excessive exercise, it will usually be relieved after rest. If it is a disease that causes back pain after running, you should go to the hospital in time to find out the specific cause of the disease and then treat it under the guidance of the doctor.