Elderly people have breathing but can not wake up prompted the emergence of coma, to clarify the causes of coma, the common causes of coma in the elderly have the following four situations: First, acute cerebrovascular accident, may be cerebral hemorrhage, may also be cerebral infarction. Second, usually have diabetes in the elderly need to pay attention to whether there is a serious hypoglycemia, or blood sugar is too high ketoacidosis, whether the blood sugar is too low or too high blood sugar will appear coma. Third, usually have chronic obstructive pulmonary disease of the elderly should think about is not the emergence of pulmonary encephalopathy, or the emergence of serious electrolyte disorders lead to hypotonic encephalopathy. Fourth, if there is a fireplace at home, we should think about whether there is carbon monoxide poisoning. For the coma of the elderly there is no life-threatening depends on the severity of the original disease, if the rescue in time, the consciousness can be restored.