The elderly must be hospitalized once they have diseases that require surgery to resolve, such as tumors of various organs, fractures, intestinal obstruction, gastrointestinal bleeding, etc. For internal system diseases, circulatory system, such as heart attack, unstable angina, heart failure, especially acute left heart failure, must be hospitalized in an emergency, otherwise it can be life-threatening. Respiratory system, once the elderly have a serious infection, pulmonary heart disease, the acute stage of all need to be hospitalized, because it can also be life-threatening. In the digestive system, vomiting blood, blood in stool, or severe vomiting or diarrhea lasting for more than one day should be sent to the hospital as soon as possible to avoid life-threatening electrolyte disorders and acid-base imbalance. In addition, acute complications of diabetes such as hypertonic coma and hypoglycemic coma require emergency hospitalization, and even chronic complications of diabetes, including diabetic foot, which cannot be treated repeatedly in the outpatient clinic, also require systematic hospitalization. Hypertension, if the blood pressure is hypertensive encephalopathy, also requires emergency hospitalization. In addition, acute ischemia and hemorrhage of the nervous system require hospitalization for resuscitation.