Weakness of one side of the arms and legs is caused by acute cerebrovascular disease, which may be caused by cerebral hemorrhage, or cerebral infarction or transient ischemic attack. It is recommended that the patient immediately consult a CT examination of the head, the results of the head CT are fast and can quickly determine whether there is cerebral hemorrhage, as follows: 1, caused by cerebral hemorrhage, active treatment should be given to dehydration, lower cranial pressure to prevent continued bleeding, which can reduce neurological damage; 2, if the head CT shows no bleeding, the weakness of one side of the hands and feet is considered to be caused by ischemic cerebrovascular disease, which may be caused by transient cerebral ischemic attack If the head CT shows no bleeding, one side of the arms and legs is considered to be caused by ischemic cerebrovascular disease, which may be caused by transient cerebral ischemic attack or cerebral infarction, it is necessary to give immediate treatment to activate blood circulation and improve circulation.