1.Degenerative diseases of the lumbar spine. The lumbar spine in the elderly is particularly prone to degeneration, and lumbar pain is the main symptom after degeneration of the lumbar spine. The causes of lumbar degeneration in the elderly are more complex and even multifaceted, such as long-term lumbar activity and excessive load, improper spinal posture, etc. Long-term lumbar spine activity and overload and spinal posture improperly can first cause dehydration of the nucleus pulposus and decrease in volume, so that the dynamic and static balance between it and the original surrounding tissues is lost, gradually causing narrowing of the vertebral space, formation of bone lips at the vertebral body edges and degeneration of the articular synovial joints, stimulating Ì compression of surrounding tissues, especially nerve tissues, thus producing symptoms of lumbar leg pain. Degeneration of other structures of the lumbar spine, such as lumbar hypertrophic spondylitis, lower lumbar instability, and age-related hunchback deformity, can also lead to symptoms of lumbar pain. The nature of lumbar pain caused by degenerative diseases of the lumbar spine is mainly soreness and pain, and it is aggravated when there is too much activity. 2, osteoporosis caused by changes in endocrine function. Changes in the secretion of sex hormones in the elderly can cause osteoporosis of the bones of the whole body, especially the lumbar spine; at the same time, it can also lead to ligament and joint capsule relaxation and reduced elasticity. For menopausal women, these changes are more common. These changes are also the pathological basis of low back pain in the elderly. 3. Body shape change. Older people often change their body shape with age, and those who are too fat or too thin are prone to cause low back pain. Those who are too fat can increase the burden of lumbar convexity due to the accumulation of abdominal fat, while those who are too thin can suffer from lumbar ligament and joint capsule laxity, resulting in lumbar instability, thus producing symptoms of lumbar and leg pain. 4, other. Kidney disorders, spinal cord tumors, etc., can also cause back and leg pain in the elderly.