The lumbar spine is not painful during the procedure because there will be sufficient anesthesia during the surgery and the procedure can only be done if there is no pain. If there is significant pain stimulation during the surgery, there is no way for the patient to cooperate with the surgeon and complete the surgery. However, after the surgery, when the anesthesia wears off, there will be some pain at the incision site, but the pain will not be particularly pronounced and will gradually decrease or even disappear within 3-5 days. Even if the pain at the incision site is particularly pronounced, oral pain medication or intravenous fluids or even intramuscular injections can be used to help relieve the pain. So ultimately, there is no need to worry too much about whether the surgical pain is intra-operative or post-operative. Because the former is no pain at all or can be greatly relieved by treatment, and is still gradually reduced.