At the age of 57, back and leg pain may be caused by osteoporosis, aging and other physiological reasons, but also by lumbar disc herniation, osteoarthritis and other pathological reasons. 1. Physiological reasons: middle-aged and old people, especially women after menopause, bone loss is relatively fast, without timely supplementation of calcium, which may cause osteoporosis, leading to the symptoms of low back and leg pain; in addition, due to aging, the bones and joints wear and tear over the years, and the accumulation of disease may also lead to low back and leg pain. 2. Pathological causes: degenerative lesions of lumbar vertebrae and decrease in the strength of soft tissues around the vertebrae may lead to lumbar disc herniation, lumbar spondylolisthesis and other diseases, and the symptoms of low back and leg pain may also occur after the nerve is pressed. In addition, autoimmune diseases or metabolic disorders may cause rheumatism, rheumatoid arthritis, gout, and other diseases of the lower back and legs, and the symptoms mentioned above may also occur. Sometimes the cause of back and leg pain cannot be accurately determined by the symptoms alone, and it is necessary to combine the characteristics of the medical history and other test results to make an accurate judgment, and it is recommended to clarify the cause of the disease under the guidance of a doctor.