Lumbar leg pain should be alert to lumbar spine pathology such as lumbar disc herniation, osteoporosis, autoimmune diseases such as ankylosing spondylitis, etc. If it occurs after exertion or exercise, it may also be a transient physiological phenomenon. Those who are not relieved after resting need to consult a doctor in time. 1. Lumbar spine lesions: such as lumbar disc herniation, lumbar spinal stenosis, lumbar spondylolisthesis, lumbar spondylolisthesis tumor lesions and infectious lesions, etc., which are sometimes accompanied by numbness and discomfort in the lower limbs, and combined with the lumbar spine CT and MRI can be clear. 2. Osteoporosis: usually occurs in the elderly and menopausal women, the pain has no fixed pressure point, combined with bone density examination and X-ray examination can be clearly diagnosed. 3. Autoimmune diseases: such as ankylosing spondylitis, accompanied by morning stiffness, the patient often wakes up at night due to back pain, and the pain can be relieved after light activities. In addition, it should be noted that low back pain may also be caused by high-intensity exercise or fatigue, resulting in the accumulation of local lactic acid or excessive weight bearing in the lower back and legs. If it is difficult to be relieved, it is recommended to consult a doctor for a clear diagnosis and treatment as prescribed by the doctor.