Running back pain may be caused by patients’ long-term lack of exercise, soft tissue injury or lumbar muscle strain. 1. Lack of exercise: patients who have back pain when running may be caused by lack of exercise, such as long time without large amount of exercise activities, which produces a large amount of lactic acid accumulation in the lumbar region caused by lumbar pain when running. 2. Soft tissue injury: if there is no warm-up and relaxation activities before running, or if there is no stretching exercise, the soft tissue of the patient will be injured when running, which will cause the phenomenon of lumbar pain. 3. Lumbar muscle strain: in daily life, patients often do some strenuous activities leading to chronic lumbar muscle and soft tissue strain, in such physical conditions, running and other sports may cause patients to experience symptoms of low back pain. Running back pain can also be seen in other causes, such as urinary stones and lumbar spondylolisthesis, etc. It is recommended to go to the hospital in a timely manner to clarify the cause of the disease, and then follow the doctor’s instructions for treatment.