The following diseases commonly seen in the elderly require hospitalization: i. Acute myocardial infarction, mostly with a history of coronary heart disease and angina pectoris. When there is an aggravation of chest pain and the investigation of electrocardiogram and cardiac ultrasound supports acute myocardial infarction, hospitalization is required. Second, in the acute exacerbation of COPD, patients mostly have cough, cough sputum, sputum sticky and not easy to cough up, serious cases can be accompanied by pulmonary heart disease and respiratory failure. It is recommended to be hospitalized for anti-inflammatory, phlegm, antispasmodic and asthma treatment, and if necessary, mechanical ventilation treatment. Pneumonia, pneumonia in the elderly is more serious, sometimes can cause respiratory failure, it is recommended to be hospitalized for anti-inflammatory and sputum treatment. Acute cerebral infarction, the patient has dizziness, unfavorable limb movement, and if severe, respiratory and circulatory failure, hospitalization is recommended. Fifth, electrolyte disorders, elderly patients are prone to hyponatremia and hypokalemia, and it is recommended to treat with sodium and potassium infusion.