After lumbar disc herniation surgery, the big toe can not be turned upward, considering hematoma compression, infection, nerve damage. 1. Hematoma compression: bleeding may occur at the site of surgery after lumbar herniated disc surgery, hematoma is too large to compress the nerves and the big toe can not be turned upward, with the gradual absorption of hematoma, it will gradually improve. 2. Infection: If the vertebral body is infected after surgery, fluid accumulation or abscess formation can compress the nerve and the big toe can not be tilted upward, through anti-inflammatory treatment or incision and drainage, the compression will gradually improve. 3. Nerve injury: During the surgery, the nerve is pulled and damaged, causing the big toe can not be turned up, through the application of nutritive nerve drugs, such as methylcobalamin, etc., with the rehabilitation therapy, some can be restored, but it is difficult to restore the nerve if it is completely severed. Therefore, after lumbar disc herniation surgery, the big toe can not be turned up, you need to go to the hospital to check the specific cause of the disease as soon as possible treatment.