As people’s pace of life accelerates and work pressure increases, more and more friends suffer from lumbar disc herniation, which has become a common orthopaedic disease and polyvalent. Nowadays, people know that the intervertebral disc is composed of fibrous ring, nucleus pulposus and cartilage plate. Simply speaking, lumbar disc herniation is mostly caused by trauma, lumbar spine aging and lumbar muscle strain, resulting in lumbar disc degeneration, fibrous ring rupture, nucleus pulposus tissue protrusion, stimulation or compression of the cauda equina nerve caused by sciatica as the main syndrome. The typical symptoms of lumbar disc herniation are: pain and discomfort in the lumbar region, accompanied by radiating pain in the legs and numbness. However, during a long period of clinical work, we found that in addition to the symptoms of appeal, some patients with lumbar disc herniation also have symptoms of edema of the lower limbs, mostly unilateral limited edema, and is this edema caused by lumbar disc herniation or not? By reviewing the literature and clinical studies, we have given a definite answer that lumbar disc herniation causes edema of the lower extremities. In the course of long clinical work and research, we found the cause of lower limb edema caused by lumbar disc herniation. After the lumbar disc herniation, it leads to the stimulation of sympathetic nerve, which causes the change of capillary permeability in the lower limbs and the extravasation of tissue fluid, which eventually leads to the edema of the lower limbs, and it belongs to the limited edema caused by neurotrophic disorder. Clinically, it can be differentiated from the following edema: 1. Local inflammatory edema, which is caused by local inflammation such as dermatitis and cellulitis, and is accompanied by local redness, swelling, heat and pain. 2, limb venous thrombosis and thrombophlebitis, venous thrombosis is the formation of thrombus in the vein, thrombophlebitis is the inflammation of the vein with the formation of thrombotic limb, both of which can appear limited edema. 3, varicose veins of lower limbs, characterized by highly dilated, curved and bulging veins in the lower legs, which are obvious when standing, and edema in the ankle and dorsum of the affected limbs, and local skin atrophy, pigmentation and ulcer formation in the late stage. 4.Chronic inferior vena cava obstruction syndrome, the causes of which include malignant tumor compression, tumor tissue invasion into the vein causing obstruction and thrombosis, etc. 5.Local mucinous edema, caused by thyroid disease. 6.Angioneurotic edema, which is a metaplastic disease, and the patient has a history of allergy to drugs, food or the surrounding environment. 7, edema due to obstruction of lymphatic reflux, which can cause limited edema in the area of lymphatic system transmission there.