There are many reasons for swollen feet in the elderly. 1, for example, the elderly because of reduced activity, long-term sitting in one place will lead to poor venous return, so there may be swollen feet, such patients often rest after the next day, swollen feet swelling can be alleviated. 2, kidney disease, because patients with kidney disease often appear glomerular filtration rate decreases, water and sodium storage, and therefore will The situation of swollen feet. This kind of patients may have urine protein and elevated creatinine and urea nitrogen in their kidney function. 3, heart disease, elderly patients often have coronary heart disease, arrhythmias and other conditions that can lead to heart failure, because the reduction of blood return will lead to the swelling of the feet. 4, malnutrition or liver disease leading to hypoproteinemia, etc., will lead to the swelling of the feet of elderly patients. 5, swelling of the feet. 5. For example, varicose veins in the legs or acute lymphangitis can also lead to swelling of the feet.