Lumbar disc herniation, also known as lumbar disc fibrous annulus rupture. This disease is caused by the degeneration of the lumbar intervertebral disc and external injury, which causes partial rupture of the annulus fibrosus and outward expansion of the nucleus pulposus from the defect of the annulus fibrosus, compressing the spinal nerve roots and causing radiated pain in the lower extremities. It is a clinical disease. It occurs mostly in young and middle-aged manual workers. It affects the patient’s participation in physical labor and daily work, and even prevents him from taking care of himself. Clinical manifestations and diagnosis: 1. Age of onset and medical history: The disease often occurs in manual workers between the ages of twenty and forty-five, more in men than in women. Most of the cases have obvious history of lumbar trauma, and a few have only a history of overwork and cold. 2. Symptoms: The main symptoms of this disease are lumbar pain and unilateral lower limbs radiating pain or numbness along certain nerve routes. The pain is aggravated when standing, walking, coughing, sneezing or stooling, and the pain can be relieved by bending the knees and hips or resting in bed. There are several types of back and leg pain caused by this disease: (1) sudden back pain after injury, followed by pain along the sciatic nerve pathway in one lower limb. This is caused by the protrusion compressing the nerve root on one side. (2) After the injury, only the lower back feels empty, or temporary pain, and the next day after getting up, the back is felt with sciatic nerve pain. (3) Transverse lumbar pain and stiffness after the injury, and sciatica appears after the lumbar pain is relieved after a few days or months. (4) Occasionally, post-injury lumbar with bilateral lower extremity pain or alternating sciatica is caused by a protrusion located in the posterior part of the vertebral body, or a protrusion moving from side to side in the spinal canal.