The danger of lumbar needle stabbing is mainly in 3 aspects. 1. it may injure the nerves, if the sensory nerves are injured, there will be superficial sensory loss in the lumbar and lower limb sensory nerve distribution areas, such as a decrease in pain and temperature sensation. 2. it may injure the motor nerves, resulting in the muscles of the lumbar and lower limb muscles not being innervated, resulting in paralysis. If the motor nerve is injured, the muscles of the lower back and lower limbs will not be innervated, resulting in paralysis and weakness. 2, there is a possibility of injury to blood vessels, such as some arterial vessels, after injury, will lead to the formation of local hematoma, may also affect the distal blood circulation, blood supply. 3, there is a possibility of injury to muscle tissue, muscle tissue injury, bleeding After the injury to muscle tissue, the bleeding is relatively large, and the pain is more obvious, affecting the normal contraction and diastolic activities of the muscles and the normal activities of the limbs.