I. Low back pain More than 60% of patients have low back pain, which is often mild compared to the pain caused by disc herniation, and has a tendency of chronic aggravation, some patients have pain when they are not active, but it is relieved after a few hours of activity, but if the activity is too long, it can produce more intense pain. Intermittent claudication This is the most characteristic symptom, walking tens of meters or a hundred meters that the lower limbs soreness, weakness, pain and even numbness, gait instability, it is difficult to continue walking. The symptoms can be relieved or disappear after sitting or squatting to rest, but can be repeated after continuing to walk. Many patients like to lean forward when walking, which is a kind of postural compensation for pain relief. By leaning forward, factors that can aggravate lumbar spinal stenosis such as yellow ligament folding can be avoided, so that the volume of the spinal canal can be relatively increased and the compressed nerves can be temporarily decompressed and the pain can be relieved. Likewise, the patient’s symptoms can be relieved in flexion positions such as going up hills, riding bicycles, and going up stairs, and aggravated when going down hills and posterior extension of the spine. C. Cauda equina syndrome When stenosis severely compresses the cauda equina nerve, it manifests as numbness and tingling in the perineum, urinary and fecal function and sexual dysfunction, which seriously affects the quality of life and requires early surgical treatment.