Risks of blood purification, i.e., risks related to hemodialysis or hemofiltration, including the following categories: 1, the treatment itself has risks, because once the blood purification is done, its own blood has to be drawn out into a dialyzer or filter, and risks will be generated at the same time as the blood is drawn out, or the patient will have rupture of membranes and other problems in the process of dialysis; 2, the blood purification should be done in a hospital or in a healthcare center, the most worrying thing is the infection. At present, the most worried about is infection, we may hear on TV or on the Internet, a dialysis room, outbreak of infectious diseases, that is, can be infected with hepatitis B, hepatitis C, syphilis, etc.; 3, the process of blood purification, the patient will appear other discomforts, such as part of the patient the more the dialysis of the higher the blood pressure, part of the patients on the machine, through the dialysis of the first, there will be low blood pressure or leg cramps, and there are patients will be a headache. Secondly, some patients will have allergy to dialyzer or filter when they just start to do blood purification.