Numbness in the legs and inability to walk in the elderly are more commonly caused by cerebrovascular disease. Due to the presence of atherosclerosis in the elderly, cerebrovascular occlusion or hemorrhage can lead to cerebral infarction or cerebral hemorrhage, which can lead to a series of symptoms of neurological deficits, such as leg numbness, leg weakness, and inability to walk. In these cases, patients should be given active treatment for cerebrovascular disease, along with medications to protect the intima and combat atherosclerosis. Leg numbness and inability to walk in the elderly can also be seen in lumbar spine diseases, such as lumbar disc herniation or lumbar spinal stenosis. Due to the herniated lumbar disc compressing the dural sac, stimulating the nerve roots or causing spinal stenosis and compression, the patient can have numbness in the legs. In severe cases, it can also be accompanied by pain in the lower extremities, resulting in the elderly unable to walk, for this case to actively treat the lumbar spine disease.