The patient’s leg is not working well anymore may be caused by cerebrovascular disease, lumbar spinal stenosis, or arteriosclerosis of the lower limbs, vascular occlusion, or inflammatory diseases of the joints of the legs. Specifically, it is necessary to combine the patient’s form of onset as well as the relevant triggering factors, examination to clarify, the first aspect, if the patient suddenly appeared on one side of the leg is not good to use, accompanied by hand movement weakness, consider the acute cerebrovascular disease caused by, such as cerebral infarction or cerebral hemorrhage. The second aspect, the patient’s brain leg bad use may also be caused by lumbar spinal stenosis, this kind of patients will have lumbar pain, leg numbness performance, frequent attacks. The third aspect, if the patient is after the activity, walking for a long time after the leg is not good, after resting the patient’s leg strength can be restored, considering the lower limb arteriosclerosis, occlusion caused by the lower limb arteries, you can do the lower limb vascular artery ultrasound to clarify.