The compression of nerve roots after lumbar disc herniation leads to edema of nerve roots due to impaired blood circulation in the area, which further leads to compression of nerves in the spinal canal under the condition of nerve root edema, and the edema problem enters into a vicious cycle, causing further aggravation of clinical symptoms. The use of mannitol mainly dehydrates and reduces the edema of the nerve roots, which can relieve the nerve compression and relieve the related clinical symptoms. After the edema period has basically passed, the use of mannitol to dehydrate and reduce swelling is not particularly effective, and bed rest, acupuncture, massage, and physical therapy are needed to help relieve clinical symptoms. Even particularly serious cases require surgery to solve the problem.