Swelling of the right foot in the elderly is commonly caused by kidney-related diseases, such as glomerulonephritis and renal insufficiency, or it may be caused by the formation of local blood clots, gout and poor venous reflux. It is necessary to go to the nephrology department of the hospital to check the kidney function, blood albumin, urine routine, uric acid, lower limb vascular ultrasound and other related indicators to further evaluate the condition and clarify the cause of the disease before the targeted drug treatment. For example, if chronic nephritis causes swollen feet, treatment can be applied to protect the kidneys, reduce urine protein drugs, oral diuretics to relieve symptoms, usually pay attention to regular follow-up, review, and monitor changes in the condition.