Low back pain is just a symptom, a common symptom in orthopedic patients, and can be described as a syndrome rather than a name for a disease. The occurrence of low back pain is related to the lumbosacral spine and surrounding structures. There are many causes of low back pain, which can be caused by the lumbar region itself, especially spinal disorders, or due to organ lesions outside the lumbar region. (1) Injury: soft tissue injury such as lumbar disc herniation, bone and joint injury such as fracture, dislocation, etc.; (2) Degenerative osteoarthropathy: such as disc degeneration, osteoporosis, etc.; (3) Congenital deformity: such as occult spina bifida, etc.; (4) Postural: such as kyphosis (hunchback), scoliosis, etc.; (5) Inflammatory: such as ankylosing spondylitis, spinal (6) primary or metastatic bone tumors; (7) nutritional and toxic: such as osteochondrosis; (8) epiphyseal disease: such as vertebral epiphysitis, etc. (2) internal diseases (1) digestive system diseases: such as rectal cancer, etc.; (2) urinary system diseases: such as kidney stones, etc.; (3) gynecological diseases: such as pelvic inflammatory disease, etc. (4) retroperitoneal tumor; (5) vascular disorders. (3) neurological disorders such as arachnoiditis and scoliosis caused by muscle paralysis or spasm caused by neurological disorders, and neuropathy. There are many causes of low back pain, and the most important thing is to clarify its etiology, focusing on early identification of serious diseases such as tumors, infections, cauda equina syndrome, fractures and abdominal aortic aneurysms.