The sciatic nerve is composed of the lumbar and sacral nerves. It comes from the lumbar 4~5 nerves and sacral 1~3 nerve roots, and is the thickest of all nerves. The sciatic nerve exits the pelvis through the inferior foramen of the pear-shaped muscle to the buttocks, travels downward in the deep side of the gluteus maximus muscle, crosses in turn the closed inner muscle, the upper and lower twin muscles and the posterior aspect of the femoral square muscle, innervates these muscles, and descends along the back of the large retractor muscle, between the semitendinosus, semimembranosus and biceps femoris muscles, and on the way sends out muscle branches to the flexor muscles of the thigh. The sciatic nerve is divided into the tibial and common peroneal nerves before it reaches the popliteal fossa. Sciatica includes the following two types: a. radicular sciatica, the most common lumbar disc herniation, often under the force, bending or strenuous activity and other triggers, acute or subacute onset, a few chronic onset, pain often from the lumbar to one side of the buttocks, thigh, popliteal fossa, lateral calf and foot radiation, burning-like or cutting-like pain, coughing and force when the pain can be increased, more so at night, the patient to avoid nerve In order to avoid nerve strain and pressure, patients often take special pain-reducing postures, such as sleeping on the healthy side, hip and knee flexion, standing on the healthy side, resulting in scoliosis over time, more bending to the healthy side, sitting into the hip tilt to the healthy side, in order to reduce the pressure on the nerve root, pulling the sciatic nerve can induce pain, or increased pain, such as Kernig’s sign positive (patients lying supine, first flexing the hip and knee at right angles, and then lifting the lower leg up, due to The knee extension is limited to less than 130 degrees and there is pain and resistance due to flexor spasm); the straight leg raise test (Lasegue’s sign) is positive (the patient lies on his back, the lower limb is extended, and the affected limb is raised less than 70 degrees and causes pain in the leg); there may be pressure pain in the sciatic nerve pathway, such as the paraspinal point, gluteal point, popliteal point, ankle point and metatarsal point, etc. There is often numbness and hypesthesia in the lateral calf and dorsal foot of the affected limb, and the gluteal muscle tone is relaxed. The thumb and flexor muscles are weak, and the Achilles tendon reflex is weak or absent. Dry sciatica can be triggered by cold or trauma; acute onset of dry sciatica can be triggered by pear-shaped muscle syndrome, compression of the sciatic nerve by an occupying lesion, and compression by a post-traumatic hematoma. The pain often radiates from the buttock to the posterior femur, posterior lateral calf and lateral foot, and is aggravated by 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. The spinal scoliosis is mostly bent to the affected side to reduce the pull on the sciatic nerve stem. Sciatic nerve pain should be treated for its cause and symptomatically. In severe cases, hormone therapy, paravertebral closure, acupuncture and physiotherapy can be used, and surgery can be considered for individual cases of ineffectiveness or chronic recurrence.