Low back pain with single leg radiating pain, most of the sciatica developed after the low back pain, and when the latter pain is obvious, the low back pain is reduced. The mechanism of low back pain is related to the tension and irritation of the herniated disc tissue on the superficial layer of the annulus fibrosus, the posterior longitudinal ligament and the anterior dural layer. These tissues are derived from the sensory fibers of the sinus nerve. When the herniated disc tissue compresses the posterior annulus fibrosus and posterior longitudinal ligament in the midline, it produces dorsal midline pain, and when the herniated disc tissue moves outward by 0.5 – 0.6 cm, it produces pain in the dice skeleton and inguinal region. When the herniated disc tissue compresses and stimulates the nerve roots located in the spinal canal, it produces lower limb pain and lateral and posterior lateral pain in the thigh and calf radiating along this nerve, and the pain is more sensitive and clear than that in the lumbar back. The pain is more sensitive and clearer than that of the low back. When the annulus fibrosus ruptures acutely, both low back pain and leg pain may occur at the same time. Only lumbar pain or only leg pain: lumbar pain is caused by the traction of the protrusion stimulating the superficial layer of the annulus fibrosus, the posterior longitudinal ligament and the dural sac layer, while leg pain is caused by stimulation of the nerve roots, so only lumbar pain can occur when the protrusion has not yet stimulated the nerve roots, such as when the slightly off-center protrusion of lumbar 4 and 5, when the smaller protrusions above lumbar 4 and 5 have not yet compressed the cauda equina, or when the larger nerve roots of the spinal canal can be compensated by lateral convexity. Only the cause of leg pain, the explanation has not yet been agreed, some people believe that it is the lack of nociceptive nerve endings or insensitivity of the fibrous ring, sudden rupture of severe leg pain or numbness of the nociceptive sensation sometimes also overshadows the mild pain, or when there is leg pain first followed by lumbar pain trilobar intervertebral disc degeneration bulge or transverse herniation can compress the nerve roots on both sides at the same time;d raw pain, but does not injure the rest of the cauda equina nerve leg pain on one side later extended to the opposite In the case of a herniated disc, the leg pain on one side may be relieved after the leg pain on the opposite side due to the protrusion of the disc from one side to the other side. It can be caused by atrophy or nerve root pressure paralysis on the original herniated side. On the contrary, the pressure within the spinal canal decreases, the intrinsic disc also decreases, and thus the pain can be reduced or relieved The patient is often curled up on his side to keep the spinal canal in a more relaxed state A recurring symptom is one of the special symptoms of a herniated disc. Intermittent claudication: intermittent claudication refers to the patient walking with increasing distance and feeling the onset or aggravation of lumbar and leg pain, forced to stop, squat and rest to relieve and then walk again. The cause of intermittent claudication is narrowing of the spinal canal or nerve root canal, and nerve root congestion during walking aggravates the narrowing of the plant or obstructs the blood supply through the roots of Buchen due to disc herniation can contribute to narrowing of the narrow spinal canal, or cause narrowing of the lateral saphenous fossa or nerve root canal.