Inserting a urinary catheter feet for a long time will be swollen is not normal, generally considered with the insertion of the urinary catheter is not directly related to, may be renal insufficiency, basic heart disease, lower extremity venous reflux obstruction and other reasons. 1. Renal insufficiency: patients with renal insufficiency, especially with nephritis, nephrotic syndrome, edema will be more obvious, such as glomerulonephritis, etc., which will damage the renal function, so that the renal filtration rate decreases, resulting in a decrease in the amount of urine, sodium and water retention caused by edema. 2. Underlying heart disease: edema is a very common sign in patients with heart failure, mainly seen in right heart failure. Due to the decline in the pumping function of the heart, the venous system causes stagnation and elevated hydrostatic pressure, and under the influence of gravity, the phenomenon of symmetrical edema of the feet will occur. 3. Lower extremity venous reflux obstruction: patients with asymmetrical swelling may be due to lower extremity venous reflux obstruction, which can lead to blood reflux and the phenomenon of swollen feet, related to lower extremity venous thrombosis, varicose veins and other factors. There are many reasons for the swelling of feet with urinary catheter insertion, and it is recommended to consult a doctor in time and treat it actively.