The elderly are susceptible to the following diseases: 1. cerebrovascular diseases, i.e. stroke, cerebral infarction, cerebral hemorrhage, and cerebral infarction; 2. neurological diseases, such as senile dementia; 3. cardiovascular diseases, including coronary heart disease, angina pectoris, hypertension, heart failure, arrhythmia; 4. respiratory system, including chronic bronchial disease, bronchial asthma, and end-stage respiratory failure; 5. kidney diseases, such as chronic nephritis There is also renal failure, uremia; 6, endocrine diseases, namely diabetes, dyslipidemia. 7, blood system diseases are still more common, anemia is also very common; 8, digestive system diseases, is functional dyspepsia or other diseases; 9, tumors, with age, the incidence of tumors is increasing.