The main causes of lumbar pain are related to structural changes of lumbar vertebrae, overexertion, trauma or lesions of internal organs. 1. Lumbar spine structure changes: If there are changes in the structure of the lumbar spine, such as lumbar spinal stenosis, lumbar disc herniation or lumbar vertebral body slippage, it is easy to compress the nerve root and the surrounding tissues, which will lead to lumbar pain and pain in the buttocks. 2. Excessive exertion: usually, if you often bend over and bear the weight of labor, or sedentary standing, lumbar and buttock parts of the load increases, easy to produce muscle fatigue, so triggered by lumbar pain and buttock pain performance. 3. Trauma: If the lumbar and buttock areas are impacted by external forces resulting in localized injuries, or if excessive exercise causes muscle soft tissue strains, it is easy to cause pain symptoms, and even accompanying functional problems. 4. Diseases of internal organs: if there are kidney diseases, such as kidney stones, ureteral stones or gynecological diseases such as pelvic inflammatory disease, it is easy to cause back pain, and even accompanied by pain in the buttock area. Persistent back pain and buttock pain, no relief after rest, should promptly seek medical attention to find the cause of the disease, and standardized treatment under the guidance of a professional physician, to prevent the aggravation of symptoms in the late stage.