There are many causes of swollen feet in the elderly, mainly due to heart disease, kidney disease, liver disease and lower limb vascular disease. 1. Heart disease such as right heart failure, mainly the contractile function of the right ventricle decreases, which leads to increased pressure in the right atrium, the return of the body circulation is impeded, there is bruising, double lower limbs, feet, the most obvious performance. 2. Renal diseases such as nephrotic syndrome, there will be severe hypoproteinemia, plasma effective osmotic pressure is reduced, resulting in an increase in fluid in the interstitial space of the tissues, due to the effect of gravity, swelling of the feet is more obvious. 3. Liver diseases such as cirrhosis, the liver is the main place for protein synthesis, when cirrhosis, the liver’s ability to synthesize protein decreases, resulting in hypoproteinemia, triggering lower limb edema. 4. Venous thrombosis or vascular valve lesions in the blood vessels of the lower limbs will lead to obstacles in blood return to the lower limbs and cause edema. Elderly people have edema of the feet, the cause is more, need to be vigilant, it is recommended to seek timely medical treatment, early detection, early treatment.