Low blood pressure after renal dialysis may be caused by drugs, arrhythmia, too much dialysis dehydration and other factors. 1. Drugs: it may be that the patient himself suffers from high blood pressure and takes antihypertensive drugs after kidney dialysis. When the dose of drugs is too much, low blood pressure will occur. 2. Excessive dehydration in dialysis: the purpose of dialysis is that the excess water in the body needs to be discharged. If the patient drinks more water in the period between dialysis, he will have to increase the dose of dialysis to get rid of the water, which will easily cause the phenomenon of low blood pressure. 3. Arrhythmia: Arrhythmia caused by the rapid change of electrolytes in the body after dialysis, such as atrial fibrillation, leads to the decrease of cardiac output per beat, which causes the phenomenon of low blood pressure. It is suggested that patients with low blood pressure after kidney dialysis should go to the hospital in time and follow the doctor’s instruction for treatment to avoid delaying their condition.