Sciatica is the pain of the sciatic nerve pathway and its distribution, i.e. pain in the posterior thigh of the buttock, posterior lateral calf and lateral foot. If the pain is recurrent, muscle atrophy of the affected lower limb may occur over time, or claudication may occur. Sciatica is divided into two categories: primary sciatica is pain caused by inflammation of the sciatic nerve, mostly unilateral, and can often occur at the same time as myofibrosis. The main causes are cold and dampness and other inflammatory lesions such as tonsillitis, prostatitis, gingivitis, sinusitis, etc. Some of them are accompanied by myositis and myofibrositis. Secondary sciatica is caused by compression or irritation of adjacent lesions, and is divided into radicular and truncal sciatica, which refer to whether the site of compression is at the nerve root or the nerve trunk, respectively. Radicular is more common, and the most common cause is disc herniation, while other causes include intravertebral tumor, vertebral metastasis, lumbar tuberculosis, lumbar spinal stenosis, etc. Dry can be caused by sacroiliac arthritis, intrapelvic tumor, compression by pregnant uterus, hip arthritis, hip trauma, pear-shaped muscle syndrome, improper gluteal muscle injection, diabetes mellitus, etc. Clinical manifestations: radiculopathy often has an acute or subacute onset under triggers such as exertion, bending or strenuous activity. A few have a chronic onset. The pain often radiates from the lumbar region to one side of the buttock, posterior thigh, N fossa, lateral calf and foot, with burning or cutting-like pain, which may increase with coughing and exertion, and is worse at night. The pain can be induced by pulling on the sciatic nerve, or the pain may increase, as in the case of a positive Kernig’s sign (the patient lies supine, bends the hip and knee at right angles, and then raises the lower leg. Due to flexor spasm, knee extension is limited to less than 130 degrees with pain and resistance); positive straight leg raise test (patient lies supine, lower extremity is extended and the affected leg is raised less than 70 degrees, causing leg pain). There may be pressure pain in the sciatic nerve pathway, such as the paralumbar point, gluteal point, N point, ankle point and metatarsal point. There is often numbness and hypesthesia in the lateral calf and dorsum of the foot of the affected limb. Dryness often develops in response to triggers such as cold or trauma. The pain often radiates from the buttock to the posterior femur, posterior lateral calf and lateral foot. The pain increases with walking, activity and traction on the sciatic nerve. The pressure point is below the gluteal point, and the Lasegue sign is positive while the Kernig sign is mostly negative. Radicular sciatica caused by lumbar disc herniation has a long history of recurrent low back pain or a history of heavy physical labor, and often develops acutely after a lumbar injury or bending labor. In addition to the typical symptoms and signs of radicular sciatica, there is lumbar muscle spasm, restricted lumbar movement and loss of physiological forward flexion, and significant pressure and radiating pain in the intervertebral space at the site of disc herniation. x-ray radiographs may show narrowing of the affected intervertebral space, and CT examination may confirm the diagnosis. In terms of treatment, bed rest (especially hard bed rest for 3-4 weeks in the early stage of disc herniation, some patients have their symptoms relieved by themselves), combined Chinese and Western medicine treatment, such as Western medicine painkillers, vitamin B, short course of corticosteroids; Chinese medicine can be used for acupuncture, tui-na, Chinese herbal medicine external application, internal treatment.