The main symptom of primary sciatica is pain that radiates along the course of the sciatic nerve from the buttock to the back of the thigh, the back and outside of the calf, and to the heel and back of the foot. This pain is intense, like a pinprick, knife-like, tearing, lightning-like pain. Often in the patient’s quiet state, such as nighttime sleep intense pain, so that the patient is difficult to sleep, or in the middle of the night pain to wake up. This kind of pain is characterized by sudden, sudden pain, radiating along the direction of the sciatic nerve, sometimes the patient in the pain at the same time accompanied by symptoms of numbness. The pain will be relieved when the patient adopts the three-flexion position, that is, bowing the waist, bending the hip, bending the knee in a relaxed state, and the pain will be aggravated when straightening the waist, hip and knee joints. The pain will be relieved by applying hot towel with warm water bag, and will be aggravated by cold or exertion. These are the symptoms of primary sciatica.