Mild posterior protrusion of the lumbar 5 sacral 1 disc indicates a central type lumbar disc bulge. A lumbar disc protruding backward forms a central type lumbar disc herniation, while a mild protrusion belongs to a lumbar disc bulge. So in general, the symptoms of lumbar disc herniation are not too serious, and it mainly protrudes to the rear, and the compression is on the dural sac and spinal cord, and the symptoms formed are mainly central nerve damage, such as pain in the lower back, weakness in the lower limbs, weakened muscle strength, and weakened reflexes. However, since the degree of protrusion is not very serious, surgical treatment is not required, and better treatment results can be achieved through strict and systematic conservative treatment.