The feet are swollen mainly for the following reasons: first, heart failure, heart failure patients due to the heart’s reduced ability to eject blood, causing pulmonary stasis, thus causing right heart failure, the resistance of the whole body blood back to the heart is easy to increase, especially easy to appear in the lower parts of the body, so it is very easy to appear swollen feet. Second, liver insufficiency, the liver is the synthesis of albumin organs, if the liver function is impaired, the ability to synthesize albumin decreased, hypoalbuminemia can cause swollen feet. Third, kidney disease, the most common is nephrotic syndrome, due to the loss of a large amount of albumin from the kidneys, if more than the synthetic capacity of the liver, will also appear hypoalbuminemia resulting in swollen feet. Fourth, lower limb vein thrombosis, such as long-term bed-ridden and lower limb activity less patients, once the formation of lower limb vein thrombosis can also appear swollen feet.