Nerve damage, infection, nucleus pulposus re-projection, and intradiscal hematoma may occur after intervertebral foramenoscopy for lumbar disc herniation. 1. Nerve damage: If nerve damage is caused by puncture during surgery, leg pain and numbness will occur, which is persistent and the symptoms will gradually worsen. 2. Postoperative infection: Infection and suppuration in the spinal canal can cause fever, chills and intracranial infection. 3. Nucleus pulposus re-protrusion: If the nucleus pulposus is not removed completely, it will cause recurrence and aggravation of leg pain and numbness. 4. Intravertebral hematoma: If the hemostasis is not complete during the operation, it will cause intravertebral hemorrhage, which will cause pain, and the compression of the nerves can lead to limitation of limb movement. The above situations are several complications that are likely to occur after intervertebral foramenoscopy surgery.