Leg pain after open surgery for lumbar disc herniation may be related to local post-surgical injury, surgical complications and other conditions. 1. Local post-surgical injury: open surgery will stimulate the nerves innervating the leg, or open surgery with large traumatic surface, there is a possibility of local tissue edema during recovery, compression of the nerves leading to leg pain, which needs to be dehydrated and diurezed, and it will gradually recover during the recovery process, which is the most common situation. 2. Surgical complications: Some of the intervertebral discs are not completely removed during the surgery and continue to press on the nerves, resulting in leg pain even after the surgery. Or postoperative blood seepage or more bleeding leads to local hematoma, compression of the nerve leg pain, this situation is generally rare. Therefore, the cause of leg pain after open surgery for lumbar disc herniation needs timely follow-up, under the guidance of the doctor, improve the relevant examination and decision, for further diagnosis and treatment.