Whether or not dialysis is recommended for a 90 year old needs to be determined based on his or her condition and his or her own situation, and cannot be generalized. If there are symptoms such as edema, hyperkalemia and heart failure that cannot be corrected by medication, dialysis should be considered. If the patient’s condition is good enough to tolerate dialysis, it is recommended that the patient undergoes dialysis to alleviate his/her condition. If there is no indication for emergency dialysis, such as hyperkalemia that cannot be corrected by drugs, acute left heart failure, etc., and the patient’s own condition is poor and he/she cannot tolerate the dialysis treatment, dialysis treatment is not recommended for the elderly in such cases. Dialysis treatment is divided into hemodialysis and peritoneal dialysis. If a 90-year-old person needs dialysis treatment, it is recommended that he or she should go to a regular hospital in time and choose an appropriate treatment under the guidance of a doctor.