If the symptoms of numbness in the left leg and left arm appear suddenly, it should be considered to be caused by acute cerebrovascular disease, and the lesion may be in the right side of the thalamus or the right side of the brain bridge. It is suggested that the patient should consult the neurology department of the hospital in time, and the doctor should conduct a physical examination and a preliminary examination of the head CT to determine the condition and actively treat it with medication. If a high-density shadow can be seen on the CT head, it is considered to be caused by cerebral hemorrhage, and treatment should be given to reduce cranial pressure by dehydration and prevent further hemorrhage. If there is no high-density shadow on CT, the patient is considered to be suffering from cerebral infarction or transient ischemic attack, and treatment should be given to activate blood circulation and improve blood circulation in the brain. Depending on the time window of the patient’s visit, different options such as thrombolysis, fibrin-lowering, anticoagulation and antiplatelet can be chosen for treatment. Cerebral protection therapy should also be given to reduce the symptoms of impaired cerebral nerve function. If the symptoms of numbness in the left arm and left leg are slow and progressive, it should be considered to be caused by intracranial occupancy.