[Clinical symptoms] (1) Low back pain Most patients have a history of low back pain for weeks or months, or a history of recurrent low back pain episodes. The degree of lumbar pain varies in severity, and in severe cases it can affect turning over and sitting up. Generally, the symptoms are alleviated after rest, and coughing, sneezing or straining during bowel movements can aggravate the pain. (2) Lower extremity radiating pain Radiating pain in the sciatic nerve region of one side of the lower extremity is the main symptom of this disease, often appearing when the lumbago disappears or decreases. The pain starts from the buttocks and gradually radiates to the back of the thigh, the outer side of the calf, and in some cases to the back of the foot, the heel or the ball of the foot, affecting standing and walking. If the protrusion is in the center, it is in the cauda equina symptoms, and bilateral protrusion, the radiation may be bilateral or alternating. (3) Lumbar mobility disorder Lumbar mobility is affected in all aspects, especially obvious in posterior extension disorder. In a few patients, forward flexion is obviously limited. (4) Scoliosis Most patients have varying degrees of lumbar scoliosis. The direction of scoliosis can indicate the location of the protrusion and the relationship of the nerve root. (5) Observed numbness: those with a long course of the disease often have subjective numbness. It is mostly confined to the posterior-lateral calf, dorsum of the foot, heel or ball of the foot. (6) Temperature drop of the affected limb Many patients feel cold in the affected limb, and on objective examination, the temperature of the affected limb is lower than that of the healthy side; some dorsalis pedis arterial pulsation is also weaker, which is due to the sympathetic nerve stimulation. This is due to sympathetic nerve stimulation. It must be differentiated from embolic arteritis.