The elderly need to identify the cause of the weakness of the arms and legs and carry out symptomatic treatment, as follows: 1. If the patient suddenly appears on one side of the arms and legs weakness is considered to be caused by cerebrovascular disease, through the head CT, head magnetic resonance examination, to clarify the condition after symptomatic treatment. For example, if it is caused by cerebral infarction, in the acute stage, the patient should be treated to activate blood circulation and improve blood circulation in the brain, so as to dissolve the clot in the blood vessel, promote the recovery of the patient’s neurological function, and improve the weakness of the patient’s limbs; 2, In this case, it may be caused by the patient’s improper diet, or the patient has diarrhea, vomiting, dehydration, etc. The patient should be given symptomatic treatment for the cause in a timely manner, and at the same time, the patient should be given potassium supplements, so that the symptoms of weakness in the hands and feet can be improved after the blood potassium rises.