The causes of low back pain may include congenital disorders of the spine, trauma, bone and joint disorders, visceral diseases, and other diseases. 1. Congenital malformations of the spine: mainly scoliosis, spina bifida, sacralization of the fifth lumbar vertebra. Often accompanied by deformity of the spine. 2. Trauma and strain: sprain of the lumbar back muscles, lumbar muscle strain, lumbar disc herniation, etc., often accompanied by lumbar activity limitation. 3. Bone and joint diseases: common ones include ankylosing spondylitis, osteoarthritis, rheumatoid arthritis, spinal tuberculosis, primary spinal tumor and metastatic tumor. 4. Diseases of internal organs: mainly cause radiating pain in the lower back, such as cholecystitis, peptic ulcer, ureteral stone and so on, which can cause lower back pain. 5. Other diseases: low back pain during pregnancy, mental and psychological low back pain, low back pain caused by improper posture and so on. The causes of low back pain are varied, and if it is difficult to relieve, you need to consult a doctor in time for examination, diagnosis and treatment.