Lumbar spinal stenosis is a clinical syndrome that occurs when the spinal canal, nerve root canal, or intervertebral foramen is narrowed for any reason causing compression of the cauda equina and/or nerve roots, and is a common cause of low back pain or low back pain. Patients with lumbar spinal stenosis may present with intermittent claudication, pain in the lower back, and symptoms of sciatica. 1. Intermittent claudication. When the patient walks a few hundred meters, he or she will experience lumbar pain, leg pain, numbness and weakness of the lower limbs on one or both sides, resulting in claudication, but after squatting or sitting down for a few minutes, he or she can continue walking again. Some studies have shown that this is related to compression factors, impaired blood circulation and inflammatory stimulation. 2. Restriction of lumbar back extension and pain. Due to the reduction or loss of effective clearance in the spinal canal, the lumbar spine is restricted when it goes from a neutral position to posterior extension, and various symptoms occur as a result. However, the symptoms are immediately relieved or alleviated when the lumbar is restored to an extended position or slightly flexed forward. Therefore, the patient can ride a bicycle, but cannot walk long distances. 3. Radicular sciatica. Occurring in patients with lateral saphenous fossa stenosis, the manifestation of sciatica will occur, and the symptoms are also more complicated. In summary, patients with lumbar spinal stenosis will have intermittent claudication, lumbar posterior extension restriction and pain, and radicular sciatica, especially intermittent claudication can appear in many diseases, so if you have the above symptoms you also need to seek medical diagnosis in time.