A herniated disc in the lumbar 3/4; lumbar 4/5; lumbar 5/sacral 1 can compress the relevant nerve roots, resulting in sciatica. Sciatic nerve consists of lumbar 4/5 and sacral 1, sacral 2, sacral 3 nerve roots, these nerve roots respectively from the intervertebral foramen, disc herniation can compress the corresponding nerve roots to produce different symptoms. 1. Lumbar 3/4 herniated disc compresses lumbar 4 nerve. Pain area: lumbar, lateral thigh, anterior medial calf. Sensory disturbances: anterior medial calf. Weakness of quadriceps muscles, weakened or absent knee reflexes in knee joints. 2. Lumbar 4/5 intervertebral disc herniation compressing lumbar 5 nerve. Pain sites: lumbar, sacroiliac, thigh and posterior lateral calf. Sensory disturbances: lateral calf, anterolateral calf and medial dorsum of foot. Functional disorders: ankle and toes, weakened calf and ankle muscles. 3. Lumbar 5/sacral 1 disc herniation compressing sacral 1 nerve. Pain sites: lumbar, sacroiliac, thigh, posterior lateral calf and heel pain. Sensory disturbances: dorsal numbness of the posterior lateral calf and toes. Functional impairment: diminished or absent ankle reflexes. If sciatic nerve symptoms occur, patients are advised to go to the hospital in time, and should be treated in a standardized way under the guidance of the doctor.