Elderly people have vomiting and diarrhea, that is, diarrhea, vomiting performance, the first consideration is the symptoms of acute gastroenteritis. Some older people, their own resistance is low, when infected with bacteria or viruses, can lead to acute inflammation of the gastric mucosa, severe vomiting and diarrhea will cause severe dehydration, especially for the elderly and frail patients will have a fatal risk, cause acute gastroenteritis causes more with improper diet, or eating unclean food related. In addition, the elderly need to rest in bed, drink plenty of saline, replenish electrolytes to prevent dehydration leading to water-electrolyte imbalance. In addition, they should be alert to acute cerebrovascular disease attacks, hypertensive encephalopathy or acute cerebral hemorrhage.