The damage of cauda equina nerve is common in clinic, which is mostly a series of neurological dysfunction caused by various congenital or acquired reasons, such as absolute or relative stenosis of lumbar spinal canal and compression of cauda equina nerve. The cauda equina nerve is damaged, and there are foreign body sensation and burning sensation in anus, rectum, perineum and lower limbs. In severe cases, there will be defecation, which will bring great inconvenience to patients. When cauda equina nerve is damaged, it can be manifested as various nerve damage symptoms below the waist 2. When the cauda equina is damaged, the boundary of sensory disturbance is clear, the groin is in front of the upper boundary, and the upper end of ilium is horizontal. Under this circumstance, all buttocks, perineum and lower limbs have sensory disorders, accompanied by spontaneous diseases (electric shock pain), perineum sensory abnormalities and radiation to lower limbs, often accompanied by painful sensory dullness. The height and degree of cauda equina injury are different, and the upper and lower limits are also different. It has been reported that the recovery of motor function is better than that of sphincter, while the recovery of sensory function is the worst. The recovery of urethral sphincter function and urinary retention patients are better than those of urinary incontinence patients.