Persistent pain below the left side of the navel after lumbar spine surgery may be caused by nerve injury, anesthesia operation, postoperative hematoma and so on. 1. Nerve damage: During lumbar spine surgery, the nerve roots or spinal cord structures around the lumbar spine may be damaged, which in turn may lead to nerve damage, causing abnormal nerve conduction function and persistent pain below the left side of the navel. 2. Anesthesia operation: lumbar spine surgery requires anesthesia of the lumbar back, such as epidural anesthesia, which requires anesthesia operation in the lumbar back, and may stimulate the nerves innervating the abdominal area when anesthesia is placed, which will cause persistent pain in the left lower part of the navel during the operation. 3. Postoperative hematoma: after surgery, due to the operation of hemostasis is not complete, drainage is not smooth and other factors, will lead to the formation of hematoma around the lumbar spine wounds, which in turn will produce stimulation of the soft tissues around the navel and cause pain manifestations. Since there are many causes of persistent pain in the lower left side of the navel after lumbar spine surgery, it is recommended to go to the hospital in time to find out the cause.