Legs are always numb, swelling causes are as follows: First, if a leg is clinically caused by brain disease, the patient exists atherosclerosis risk factors, such as high blood pressure, high blood sugar, high blood lipids, as well as smoking, drinking, etc., brain infarcts or microhemorrhage, the patient appeared in a leg numbness, swelling, the treatment of cerebrovascular disease to give the appropriate treatment approach. Second, the leg is always numbness and swelling, clinically seen in lumbar spine disease, such as lumbar intervertebral disc herniation or lumbar spinal stenosis, prominent lumbar intervertebral discs compression of the sciatic nerve, appearing in a leg line-like numbness, swelling, serious cases of walking limp, etc., the treatment is mainly aimed at the lumbar intervertebral disc herniation, massage, physiotherapy and other therapeutic methods, if necessary, surgery.