Lumbar spinal stenosis Refers to any form of narrowing of the spinal canal, nerve root canal, and intervertebral foramen due to congenital developmental causes or acquired degeneration and other factors, causing compression or irritation of the cauda equina or nerve root and a series of clinical manifestations of the syndrome. 1, intermittent claudication: when standing upright or walking, gradually increasing pain, numbness, heaviness, weakness and other sensations occur in the lower extremities, the symptoms can be reduced or disappear after squatting or resting for a moment, continue to stand or walk, the symptoms reappear and forced to rest again. Because of repeated walking and resting, the walking distance is gradually shortened. Intermittent claudication may not occur when climbing mountains or riding bicycles. 2. Lower back pain: Most patients with lumbar spinal stenosis have a history of lower back pain or are accompanied by lower back pain. The pain is generally mild and is relieved or disappears when resting in bed, and the lumbar forward flexion is not restricted, but the posterior extension is often limited. 3. Nerve root compression symptoms and signs: Nerve root canal stenosis causes corresponding symptoms and signs of nerve root compression or irritation. Some patients show intermittent claudication, while others show persistent radiological nerve root symptoms, mostly soreness, numbness, swelling and pain, with different degrees of pain. The location of nerve root symptoms is related to the compressed nerve root, which is manifested as reduced pinprick sensation, abnormal pain sensation, reduced muscle strength and abnormal tendon reflexes in the corresponding nerve root distribution area. 4, cauda equina nerve compression: lumbar spinal stenosis can lead to compression of the cauda equina nerve, numbness in the perineum, persistent constipation, often dirty juice in the underwear, and in severe cases, symptoms of urinary and faecal and sexual life disorders.