There are certain risks for 80-year-old people to undergo hemodialysis, and some patients are prone to lung infection, hypertension, heart failure, cerebral hemorrhage and other risks. 1. Lung infection: because the resistance of the elderly is low, hemodialysis needs to go in and out of the hospital frequently, it is easy to have lung infection. 2. High blood pressure and heart failure: Because the blood vessels of the elderly are less elastic, repeated dialysis can easily lead to high blood pressure and heart failure, and even serious cases can be life-threatening. 3. Cerebral hemorrhage: frequent hemodialysis patients need to use anticoagulants such as low molecular heparin, etc.; it is easy to have abnormal coagulation function, aggravate the occurrence of cerebrovascular disease, and prone to cerebral hemorrhage, and some of the elderly will also have gastrointestinal bleeding and so on. It is recommended that 80-year-olds undergo hemodialysis under the guidance of professional doctors to reduce the incidence of risk and improve the quality of survival of patients.