Common causes of low back pain: 1, acute or chronic injury: acute or chronic injury to the muscles, fascia, ligaments, intervertebral small joints of the waist or leg, spinal fracture or subluxation, intervertebral disc injury, and so on. Degenerative changes: spinal osteoarthropathy, senile osteoporosis, degenerative disc changes, spinal stenosis, etc. 3.Congenital dysplasia: hidden spina bifida, vertebral or accessory deformity, spondylolisthesis, hip deformity, congenital developmental deformity of the femoral head, separation of the epiphysis of the knee, knee cartilage insufficiency, knee flexion deformity and so on. Inflammatory changes: spinal tuberculosis, ankylosing spondylitis, rheumatic fibrositis or myofasciitis, rheumatoid arthritis, sacroiliac arthritis, knee osteoarthritis and so on. 5.Functional defects: poor posture, pregnancy, flat feet, unequal length of the lower limbs or lack of hip muscle strength. 6.Diseases of internal organs: diseases of urinary and reproductive organs, liver disease, etc. 7.Tumor: primary bone tumor, metastatic bone tumor, nerve tumor, etc. 8.Others: excessive obesity, blood diseases, endocrine disorders, mental factors, the influence of bedding, etc.