Dialysis may include peritoneal dialysis or hemodialysis and is used to treat patients with renal failure. The causes of swollen feet after dialysis may be related to lower extremity venous thrombosis, insufficient dialysis or heart failure. 1. Lower extremity venous thrombosis: Hemodialysis can have complications such as thrombosis, hypotension, etc. If unilateral foot or leg swelling occurs, it should be considered to be related to lower extremity venous thrombosis, therefore, for deep vein catheter dialysis or artificial blood vessel dialysis, long-term anticoagulation is needed. 2. Inadequate dialysis: when the dialysis program is not appropriate, the excess metabolites and sodium and water in the body can not be discharged in a timely manner, and bilateral leg or foot swelling may occur. 3. Heart failure: If dialysis patients suffer from heart failure, due to the decrease of cardiac output, blood will be stagnated in the venous system, resulting in swollen feet and other manifestations. If patients have swollen feet after dialysis, it is recommended to go to regular hospitals in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment under the guidance of the doctor.