It is not possible to determine how long an elderly person can live by his or her body swelling. Causes of body swelling in the elderly include localized swelling caused by benign diseases, which usually does not affect life expectancy when treated promptly. Generalized swelling caused by malignant diseases may shorten the remaining life expectancy. 1. benign diseases such as venous thrombosis caused by obstruction of venous return in the lower limbs, swelling, timely removal of the thrombus to make the lower limbs blood flow, can make the swelling disappear. Generally, it does not affect the life expectancy. 2. Malignant diseases such as hepatocellular carcinoma can cause the decrease of colloid osmotic pressure and circulatory disorders, resulting in hypoproteinemia, ascites and other disorders, and hepatogenic edema. Therefore, if left untreated, it will cause gradual failure of other organs in the body, which may result in death within a short period of time such as 1-2 months. There are many causes of body edema, so it is recommended to go to the hospital to identify the cause of the above symptoms, and then actively treat it to avoid delaying the condition.