Classification of lumbar disc herniation Lumbar disc herniation can be classified according to the direction of nucleus pulposus protrusion: 1. posterior protrusion type: clinical symptoms are obvious. 2.Anterior herniated type: generally no obvious clinical symptoms. 3.Intravertebral variant: no nerve root compression symptoms except for local symptoms. Symptoms of lumbar disc herniation The specific clinical manifestation of lumbar disc herniation is mainly lower back pain and radiation along the sciatic nerve to the lower limbs. The severity of the pain depends on the degree of compression of the nerve root, and the size and location of the lumbar disc herniation, the size of its own spinal canal, the morphology and the tension of the nerve tissue, etc. determine the strength of the spinal nerve root compression. In addition, if the disc protrudes into the spinal canal, it may compress the cauda equina nerve and cause partial bilateral lower limb paralysis, perineal numbness and urinary and fecal dysfunction, and numbness in the lower leg, lateral dorsum of the foot, heel and lateral plantar area is common in long-standing cases. x-ray, CT and magnetic resonance imaging can clarify the diagnosis.