Spinal anesthesia can produce the following sequelae: First, head pain: it mostly occurs 1-3 days after anesthesia, and it is most obvious when the patient raises his head or gets up and moves for the first time after the operation. Second, urinary retention: urinary retention is a common complication after spinal anesthesia, mainly caused by the sacral nerve innervating the bladder being blocked and recovering late. Third, cranial nerve palsy: the nerve that is especially susceptible to involvement is the sixth pair of spreading nerves, and the patient develops about one week after lumbar anesthesia, and will have strabismus and diplopia. Fourth, adhesive arachnoiditis: it can lead to lower limb paralysis, and most of the patients’ condition keeps progressing, which makes the paraplegic plane rise, and the prognosis is not good. Fifth, cauda equina syndrome: it manifests as sensory and motor disorders in the perineal area and distal lower limbs, which is the result of damage to the cauda equina plexus nerve. Sixth, septic myelitis: due to the entry of bacteria during anesthesia, it leads to sepsis and can even be life-threatening.