The human cauda equina nerve is mainly located in the lumbar spinal canal or sacrococcygeal region, and the presence of compression of the cauda equina nerve in the lumbar spinal canal or sacrococcygeal region will have many clinical manifestations. First of all, if the compression of the dural sac is caused by lumbar disc herniation, after the compression of the cauda equina nerve, the patient will feel pain in the lumbar region, with obvious pressure pain, positive percussion pain, positive straight leg raise test of both lower limbs, and tingling sensation in the skin of both lower limbs, weakened muscle strength, and obvious limitation of functional activities of the lumbar region. An X-ray, CT film or MRI film of the lumbar spine can be taken, and the degree of compression and the stage of compression can be clearly diagnosed. In addition, if the patient is compressing the cauda equina nerve due to a cyst arising in the sacrococcygeal region, an MRI film of the sacrococcygeal region or an ultrasound examination of the sacrococcygeal region can be taken to also clarify the exact location and size of the cyst and the degree of compression.